215372431 has 2 divisors, whose sum is σ = 215372432. Its totient is φ = 215372430.

The previous prime is 215372419. The next prime is 215372477. The reversal of 215372431 is 134273512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215372431 is a prime.

It is a super-2 number, since 2×215372431² = 92770568069699522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215372431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215372401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107686215 + 107686216.

It is an arithmetic number, because the mean of its divisors is an integer number (107686216).

Almost surely, 2^215372431 is an apocalyptic number.

215372431 is a deficient number, since it is larger than the sum of its proper divisors (1).

215372431 is an equidigital number, since it uses as much as digits as its factorization.

215372431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 28.

The square root of 215372431 is about 14675.5725953027. The cubic root of 215372431 is about 599.4183539212.

The spelling of 215372431 in words is "two hundred fifteen million, three hundred seventy-two thousand, four hundred thirty-one".