31423657 has 2 divisors, whose sum is σ = 31423658. Its totient is φ = 31423656.

The previous prime is 31423649. The next prime is 31423661. The reversal of 31423657 is 75632413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26666896 + 4756761 = 5164^2 + 2181^2 .

It is a cyclic number.

It is not a de Polignac number, because 31423657 - 2³ = 31423649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31423627) 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 as a sum of consecutive naturals, namely, 15711828 + 15711829.

It is an arithmetic number, because the mean of its divisors is an integer number (15711829).

Almost surely, 2^31423657 is an apocalyptic number.

It is an amenable number.

31423657 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423657 is an equidigital number, since it uses as much as digits as its factorization.

31423657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 31.

The square root of 31423657 is about 5605.6807793523. The cubic root of 31423657 is about 315.5626360070.

The spelling of 31423657 in words is "thirty-one million, four hundred twenty-three thousand, six hundred fifty-seven".