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121031 = 127953
BaseRepresentation
bin11101100011000111
320011000122
4131203013
512333111
62332155
71012601
oct354307
9204018
10121031
1182a29
125a05b
1343121
1432171
1525cdb
hex1d8c7

121031 has 4 divisors (see below), whose sum is σ = 122112. Its totient is φ = 119952.

The previous prime is 121021. The next prime is 121039. The reversal of 121031 is 130121.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-121031 is a prime.

It is a super-2 number, since 2×1210312 = 29297005922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121031.

It is not an unprimeable number, because it can be changed into a prime (121039) 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, 350 + ... + 603.

It is an arithmetic number, because the mean of its divisors is an integer number (30528).

2121031 is an apocalyptic number.

121031 is a deficient number, since it is larger than the sum of its proper divisors (1081).

121031 is an equidigital number, since it uses as much as digits as its factorization.

121031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 121031 is about 347.8950991319. The cubic root of 121031 is about 49.4650980032.

Adding to 121031 its reverse (130121), we get a palindrome (251152).

The spelling of 121031 in words is "one hundred twenty-one thousand, thirty-one".

Divisors: 1 127 953 121031