31457969 has 2 divisors, whose sum is σ = 31457970. Its totient is φ = 31457968.

The previous prime is 31457929. The next prime is 31457989. The reversal of 31457969 is 96975413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31360000 + 97969 = 5600^2 + 313^2 .

It is an emirp because it is prime and its reverse (96975413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31457969 - 2¹⁶ = 31392433 is a prime.

It is a super-2 number, since 2×31457969² = 1979207627209922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31457929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15728984 + 15728985.

It is an arithmetic number, because the mean of its divisors is an integer number (15728985).

Almost surely, 2^31457969 is an apocalyptic number.

It is an amenable number.

31457969 is a deficient number, since it is larger than the sum of its proper divisors (1).

31457969 is an equidigital number, since it uses as much as digits as its factorization.

31457969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 31457969 is about 5608.7404111797. The cubic root of 31457969 is about 315.6774502123.

The spelling of 31457969 in words is "thirty-one million, four hundred fifty-seven thousand, nine hundred sixty-nine".