31532489 has 2 divisors, whose sum is σ = 31532490. Its totient is φ = 31532488.

The previous prime is 31532477. The next prime is 31532497. The reversal of 31532489 is 98423513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 840889 = 5540^2 + 917^2 .

It is a cyclic number.

It is not a de Polignac number, because 31532489 - 2²⁰ = 30483913 is a prime.

It is not a weakly prime, because it can be changed into another prime (31532429) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15766244 + 15766245.

It is an arithmetic number, because the mean of its divisors is an integer number (15766245).

Almost surely, 2^31532489 is an apocalyptic number.

It is an amenable number.

31532489 is a deficient number, since it is larger than the sum of its proper divisors (1).

31532489 is an equidigital number, since it uses as much as digits as its factorization.

31532489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 31532489 is about 5615.3796844025. The cubic root of 31532489 is about 315.9265204625.

The spelling of 31532489 in words is "thirty-one million, five hundred thirty-two thousand, four hundred eighty-nine".