31129057 has 6 divisors (see below), whose sum is σ = 33068198. Its totient is φ = 29297664.

The previous prime is 31129039. The next prime is 31129061. The reversal of 31129057 is 75092113.

It can be written as a sum of positive squares in 3 ways, for example, as 21911761 + 9217296 = 4681^2 + 3036^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31129057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31129457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53568 + ... + 54145.

Almost surely, 2^31129057 is an apocalyptic number.

It is an amenable number.

31129057 is a deficient number, since it is larger than the sum of its proper divisors (1939141).

31129057 is a wasteful number, since it uses less digits than its factorization.

31129057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107747 (or 107730 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 31129057 is about 5579.3419862919. The cubic root of 31129057 is about 314.5733941199.

The spelling of 31129057 in words is "thirty-one million, one hundred twenty-nine thousand, fifty-seven".