31311419 has 2 divisors, whose sum is σ = 31311420. Its totient is φ = 31311418.

The previous prime is 31311407. The next prime is 31311421. The reversal of 31311419 is 91411313.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311419 is a prime.

It is a super-2 number, since 2×31311419² = 1960809919587122, which contains 22 as substring.

Together with 31311421, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31311394 and 31311403.

It is not a weakly prime, because it can be changed into another prime (31311479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655709 + 15655710.

It is an arithmetic number, because the mean of its divisors is an integer number (15655710).

Almost surely, 2^31311419 is an apocalyptic number.

31311419 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311419 is an equidigital number, since it uses as much as digits as its factorization.

31311419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 23.

The square root of 31311419 is about 5595.6607295296. The cubic root of 31311419 is about 315.1864823398.

The spelling of 31311419 in words is "thirty-one million, three hundred eleven thousand, four hundred nineteen".