31368431 has 2 divisors, whose sum is σ = 31368432. Its totient is φ = 31368430.

The previous prime is 31368427. The next prime is 31368433. The reversal of 31368431 is 13486313.

It is a strong prime.

It is an emirp because it is prime and its reverse (13486313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31368431 - 2² = 31368427 is a prime.

It is a super-2 number, since 2×31368431² = 1967956926803522, which contains 22 as substring.

Together with 31368433, 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 = 31368394 and 31368403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31368433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15684215 + 15684216.

It is an arithmetic number, because the mean of its divisors is an integer number (15684216).

Almost surely, 2^31368431 is an apocalyptic number.

31368431 is a deficient number, since it is larger than the sum of its proper divisors (1).

31368431 is an equidigital number, since it uses as much as digits as its factorization.

31368431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 31368431 is about 5600.7527172693. The cubic root of 31368431 is about 315.3776640988.

The spelling of 31368431 in words is "thirty-one million, three hundred sixty-eight thousand, four hundred thirty-one".