31314919 has 2 divisors, whose sum is σ = 31314920. Its totient is φ = 31314918.

The previous prime is 31314911. The next prime is 31314931. The reversal of 31314919 is 91941313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31314919 - 2³ = 31314911 is a prime.

It is a super-2 number, since 2×31314919² = 1961248303953122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31314911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15657459 + 15657460.

It is an arithmetic number, because the mean of its divisors is an integer number (15657460).

Almost surely, 2^31314919 is an apocalyptic number.

31314919 is a deficient number, since it is larger than the sum of its proper divisors (1).

31314919 is an equidigital number, since it uses as much as digits as its factorization.

31314919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The square root of 31314919 is about 5595.9734631251. The cubic root of 31314919 is about 315.1982257828.

The spelling of 31314919 in words is "thirty-one million, three hundred fourteen thousand, nine hundred nineteen".