31318957 has 8 divisors (see below), whose sum is σ = 32171832. Its totient is φ = 30470400.

The previous prime is 31318943. The next prime is 31318961. The reversal of 31318957 is 75981313.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 171396 + 31147561 = 414^2 + 5581^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31318957 - 2¹⁹ = 30794669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31318907) 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 7 ways as a sum of consecutive naturals, for example, 18073 + ... + 19729.

It is an arithmetic number, because the mean of its divisors is an integer number (4021479).

Almost surely, 2^31318957 is an apocalyptic number.

It is an amenable number.

31318957 is a deficient number, since it is larger than the sum of its proper divisors (852875).

31318957 is a wasteful number, since it uses less digits than its factorization.

31318957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159.

The product of its digits is 22680, while the sum is 37.

The square root of 31318957 is about 5596.3342466297. The cubic root of 31318957 is about 315.2117732736.

The spelling of 31318957 in words is "thirty-one million, three hundred eighteen thousand, nine hundred fifty-seven".