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121120031 = 195162081
BaseRepresentation
bin1110011100000…
…10010100011111
322102220112110002
413032002110133
5222001320111
620004004515
73000334424
oct716022437
9272815402
10121120031
11624072aa
123469073b
131c129976
141212bd4b
15a97763b
hex738251f

121120031 has 4 divisors (see below), whose sum is σ = 121184064. Its totient is φ = 121056000.

The previous prime is 121120009. The next prime is 121120057. The reversal of 121120031 is 130021121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130021121 = 433023747.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-121120031 is a prime.

It is a super-2 number, since 2×1211200312 = 29340123818881922, 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 = 121119994 and 121120021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120061) 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, 29090 + ... + 32991.

It is an arithmetic number, because the mean of its divisors is an integer number (30296016).

Almost surely, 2121120031 is an apocalyptic number.

121120031 is a deficient number, since it is larger than the sum of its proper divisors (64033).

121120031 is an equidigital number, since it uses as much as digits as its factorization.

121120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64032.

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

The square root of 121120031 is about 11005.4546021507. The cubic root of 121120031 is about 494.7722395370.

Adding to 121120031 its reverse (130021121), we get a palindrome (251141152).

The spelling of 121120031 in words is "one hundred twenty-one million, one hundred twenty thousand, thirty-one".

Divisors: 1 1951 62081 121120031