31232989 has 2 divisors, whose sum is σ = 31232990. Its totient is φ = 31232988.

The previous prime is 31232959. The next prime is 31233023. The reversal of 31232989 is 98923213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21930489 + 9302500 = 4683^2 + 3050^2 .

It is an emirp because it is prime and its reverse (98923213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31232989 - 2²¹ = 29135837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31232959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15616494 + 15616495.

It is an arithmetic number, because the mean of its divisors is an integer number (15616495).

Almost surely, 2^31232989 is an apocalyptic number.

It is an amenable number.

31232989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31232989 is an equidigital number, since it uses as much as digits as its factorization.

31232989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 31232989 is about 5588.6482265392. The cubic root of 31232989 is about 314.9230987214.

The spelling of 31232989 in words is "thirty-one million, two hundred thirty-two thousand, nine hundred eighty-nine".