31290057 has 10 divisors (see below), whose sum is σ = 46742058. Its totient is φ = 20859984.

The previous prime is 31290029. The next prime is 31290059. The reversal of 31290057 is 75009213.

It can be written as a sum of positive squares in only one way, i.e., 31036041 + 254016 = 5571^2 + 504^2 .

It is not a de Polignac number, because 31290057 - 2¹⁰ = 31289033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31290057.

It is not an unprimeable number, because it can be changed into a prime (31290059) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 193068 + ... + 193229.

Almost surely, 2^31290057 is an apocalyptic number.

It is an amenable number.

31290057 is a deficient number, since it is larger than the sum of its proper divisors (15452001).

31290057 is an equidigital number, since it uses as much as digits as its factorization.

31290057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386309 (or 386300 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 31290057 is about 5593.7516033517. The cubic root of 31290057 is about 315.1147880973.

The spelling of 31290057 in words is "thirty-one million, two hundred ninety thousand, fifty-seven".