31245689 has 2 divisors, whose sum is σ = 31245690. Its totient is φ = 31245688.

The previous prime is 31245653. The next prime is 31245701. The reversal of 31245689 is 98654213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28944400 + 2301289 = 5380^2 + 1517^2 .

It is a cyclic number.

It is not a de Polignac number, because 31245689 - 2²⁰ = 30197113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31245889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15622844 + 15622845.

It is an arithmetic number, because the mean of its divisors is an integer number (15622845).

Almost surely, 2^31245689 is an apocalyptic number.

It is an amenable number.

31245689 is a deficient number, since it is larger than the sum of its proper divisors (1).

31245689 is an equidigital number, since it uses as much as digits as its factorization.

31245689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 31245689 is about 5589.7843428884. The cubic root of 31245689 is about 314.9657777552.

The spelling of 31245689 in words is "thirty-one million, two hundred forty-five thousand, six hundred eighty-nine".