86415431 has 2 divisors, whose sum is σ = 86415432. Its totient is φ = 86415430.

The previous prime is 86415419. The next prime is 86415451. The reversal of 86415431 is 13451468.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86415431 is a prime.

It is a super-2 number, since 2×86415431² = 14935253429831522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86415451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43207715 + 43207716.

It is an arithmetic number, because the mean of its divisors is an integer number (43207716).

Almost surely, 2^86415431 is an apocalyptic number.

86415431 is a deficient number, since it is larger than the sum of its proper divisors (1).

86415431 is an equidigital number, since it uses as much as digits as its factorization.

86415431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 86415431 is about 9295.9900494783. The cubic root of 86415431 is about 442.1100969230.

Adding to 86415431 its reverse (13451468), we get a palindrome (99866899).

The spelling of 86415431 in words is "eighty-six million, four hundred fifteen thousand, four hundred thirty-one".