31325689 has 2 divisors, whose sum is σ = 31325690. Its totient is φ = 31325688.

The previous prime is 31325677. The next prime is 31325711. The reversal of 31325689 is 98652313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31270464 + 55225 = 5592^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 31325689 - 2¹¹ = 31323641 is a prime.

It is a Chen prime.

It is equal to p_1934785 and since 31325689 and 1934785 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31325669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15662844 + 15662845.

It is an arithmetic number, because the mean of its divisors is an integer number (15662845).

Almost surely, 2^31325689 is an apocalyptic number.

It is an amenable number.

31325689 is a deficient number, since it is larger than the sum of its proper divisors (1).

31325689 is an equidigital number, since it uses as much as digits as its factorization.

31325689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 31325689 is about 5596.9356794589. The cubic root of 31325689 is about 315.2343565462.

The spelling of 31325689 in words is "thirty-one million, three hundred twenty-five thousand, six hundred eighty-nine".