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1121020031 = 2554143891
BaseRepresentation
bin100001011010001…
…0110100001111111
32220010101201101102
41002310112201333
54243440120111
6303123203315
736531340655
oct10264264177
92803351342
101121020031
11525871a3a
1227351653b
1314b330481
14a8c50dd5
156863913b
hex42d1687f

1121020031 has 4 divisors (see below), whose sum is σ = 1121089464. Its totient is φ = 1120950600.

The previous prime is 1121020009. The next prime is 1121020049. The reversal of 1121020031 is 1300201211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1300201211 = 2525351487.

It is a cyclic number.

It is not a de Polignac number, because 1121020031 - 218 = 1120757887 is a prime.

It is a super-2 number, since 2×11210200312 = 2513371819806481922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121019994 and 1121020021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121020091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3596 + ... + 47486.

It is an arithmetic number, because the mean of its divisors is an integer number (280272366).

Almost surely, 21121020031 is an apocalyptic number.

1121020031 is a deficient number, since it is larger than the sum of its proper divisors (69433).

1121020031 is an equidigital number, since it uses as much as digits as its factorization.

1121020031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69432.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1121020031 is about 33481.6372210201. The cubic root of 1121020031 is about 1038.8139928612.

Adding to 1121020031 its reverse (1300201211), we get a palindrome (2421221242).

The spelling of 1121020031 in words is "one billion, one hundred twenty-one million, twenty thousand, thirty-one".

Divisors: 1 25541 43891 1121020031