31145957 has 2 divisors, whose sum is σ = 31145958. Its totient is φ = 31145956.

The previous prime is 31145953. The next prime is 31145977. The reversal of 31145957 is 75954113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30316036 + 829921 = 5506^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 31145957 - 2² = 31145953 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31145953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15572978 + 15572979.

It is an arithmetic number, because the mean of its divisors is an integer number (15572979).

Almost surely, 2^31145957 is an apocalyptic number.

It is an amenable number.

31145957 is a deficient number, since it is larger than the sum of its proper divisors (1).

31145957 is an equidigital number, since it uses as much as digits as its factorization.

31145957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 35.

The square root of 31145957 is about 5580.8562963044. The cubic root of 31145957 is about 314.6303112374.

The spelling of 31145957 in words is "thirty-one million, one hundred forty-five thousand, nine hundred fifty-seven".