31574989 has 2 divisors, whose sum is σ = 31574990. Its totient is φ = 31574988.

The previous prime is 31574981. The next prime is 31574999. The reversal of 31574989 is 98947513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27405225 + 4169764 = 5235^2 + 2042^2 .

It is a cyclic number.

It is not a de Polignac number, because 31574989 - 2³ = 31574981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31574981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15787494 + 15787495.

It is an arithmetic number, because the mean of its divisors is an integer number (15787495).

Almost surely, 2^31574989 is an apocalyptic number.

It is an amenable number.

31574989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31574989 is an equidigital number, since it uses as much as digits as its factorization.

31574989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 31574989 is about 5619.1626600411. The cubic root of 31574989 is about 316.0683937043.

The spelling of 31574989 in words is "thirty-one million, five hundred seventy-four thousand, nine hundred eighty-nine".