31314989 has 2 divisors, whose sum is σ = 31314990. Its totient is φ = 31314988.

The previous prime is 31314979. The next prime is 31315007. The reversal of 31314989 is 98941313.

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., 29789764 + 1525225 = 5458^2 + 1235^2 .

It is an emirp because it is prime and its reverse (98941313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31314989 - 2¹² = 31310893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31314919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15657494 + 15657495.

It is an arithmetic number, because the mean of its divisors is an integer number (15657495).

Almost surely, 2^31314989 is an apocalyptic number.

It is an amenable number.

31314989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31314989 is an equidigital number, since it uses as much as digits as its factorization.

31314989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 31314989 is about 5595.9797176187. The cubic root of 31314989 is about 315.1984606427.

The spelling of 31314989 in words is "thirty-one million, three hundred fourteen thousand, nine hundred eighty-nine".