31557023 has 2 divisors, whose sum is σ = 31557024. Its totient is φ = 31557022.

The previous prime is 31557013. The next prime is 31557077. The reversal of 31557023 is 32075513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31557023 - 2⁴ = 31557007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31556983 and 31557001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31557013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15778511 + 15778512.

It is an arithmetic number, because the mean of its divisors is an integer number (15778512).

Almost surely, 2^31557023 is an apocalyptic number.

31557023 is a deficient number, since it is larger than the sum of its proper divisors (1).

31557023 is an equidigital number, since it uses as much as digits as its factorization.

31557023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 26.

The square root of 31557023 is about 5617.5637958104. The cubic root of 31557023 is about 316.0084352553.

The spelling of 31557023 in words is "thirty-one million, five hundred fifty-seven thousand, twenty-three".