31725091 has 2 divisors, whose sum is σ = 31725092. Its totient is φ = 31725090.

The previous prime is 31725061. The next prime is 31725097. The reversal of 31725091 is 19052713.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31725091 - 2⁷ = 31724963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31725097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15862545 + 15862546.

It is an arithmetic number, because the mean of its divisors is an integer number (15862546).

Almost surely, 2^31725091 is an apocalyptic number.

31725091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31725091 is an equidigital number, since it uses as much as digits as its factorization.

31725091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 31725091 is about 5632.5030847750. The cubic root of 31725091 is about 316.5684468546.

The spelling of 31725091 in words is "thirty-one million, seven hundred twenty-five thousand, ninety-one".