215319431 has 2 divisors, whose sum is σ = 215319432. Its totient is φ = 215319430.

The previous prime is 215319427. The next prime is 215319449. The reversal of 215319431 is 134913512.

215319431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215319431 - 2² = 215319427 is a prime.

It is a super-2 number, since 2×215319431² = 92724914732327522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215319394 and 215319403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215312431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107659715 + 107659716.

It is an arithmetic number, because the mean of its divisors is an integer number (107659716).

Almost surely, 2^215319431 is an apocalyptic number.

215319431 is a deficient number, since it is larger than the sum of its proper divisors (1).

215319431 is an equidigital number, since it uses as much as digits as its factorization.

215319431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 215319431 is about 14673.7667624915. The cubic root of 215319431 is about 599.3691805289.

The spelling of 215319431 in words is "two hundred fifteen million, three hundred nineteen thousand, four hundred thirty-one".