31459997 has 4 divisors (see below), whose sum is σ = 32227356. Its totient is φ = 30692640.

The previous prime is 31459993. The next prime is 31459999. The reversal of 31459997 is 79995413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79995413 = 199 ⋅401987.

It can be written as a sum of positive squares in 2 ways, for example, as 1110916 + 30349081 = 1054^2 + 5509^2 .

It is a cyclic number.

It is not a de Polignac number, because 31459997 - 2² = 31459993 is a prime.

It is a super-2 number, since 2×31459997² = 1979462822480018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31459993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383618 + ... + 383699.

It is an arithmetic number, because the mean of its divisors is an integer number (8056839).

Almost surely, 2^31459997 is an apocalyptic number.

It is an amenable number.

31459997 is a deficient number, since it is larger than the sum of its proper divisors (767359).

31459997 is an equidigital number, since it uses as much as digits as its factorization.

31459997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767358.

The product of its digits is 306180, while the sum is 47.

The square root of 31459997 is about 5608.9211975210. The cubic root of 31459997 is about 315.6842336563.

The spelling of 31459997 in words is "thirty-one million, four hundred fifty-nine thousand, nine hundred ninety-seven".