31725457 has 2 divisors, whose sum is σ = 31725458. Its totient is φ = 31725456.

The previous prime is 31725439. The next prime is 31725467. The reversal of 31725457 is 75452713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26635921 + 5089536 = 5161^2 + 2256^2 .

It is a cyclic number.

It is not a de Polignac number, because 31725457 - 2¹¹ = 31723409 is a prime.

It is not a weakly prime, because it can be changed into another prime (31725437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15862728 + 15862729.

It is an arithmetic number, because the mean of its divisors is an integer number (15862729).

Almost surely, 2^31725457 is an apocalyptic number.

It is an amenable number.

31725457 is a deficient number, since it is larger than the sum of its proper divisors (1).

31725457 is an equidigital number, since it uses as much as digits as its factorization.

31725457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29400, while the sum is 34.

The square root of 31725457 is about 5632.5355746768. The cubic root of 31725457 is about 316.5696642255.

The spelling of 31725457 in words is "thirty-one million, seven hundred twenty-five thousand, four hundred fifty-seven".