31345999 has 2 divisors, whose sum is σ = 31346000. Its totient is φ = 31345998.

The previous prime is 31345997. The next prime is 31346027. The reversal of 31345999 is 99954313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31345999 - 2¹ = 31345997 is a prime.

Together with 31345997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31345997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15672999 + 15673000.

It is an arithmetic number, because the mean of its divisors is an integer number (15673000).

Almost surely, 2^31345999 is an apocalyptic number.

31345999 is a deficient number, since it is larger than the sum of its proper divisors (1).

31345999 is an equidigital number, since it uses as much as digits as its factorization.

31345999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131220, while the sum is 43.

The square root of 31345999 is about 5598.7497711543. The cubic root of 31345999 is about 315.3024691913.

The spelling of 31345999 in words is "thirty-one million, three hundred forty-five thousand, nine hundred ninety-nine".