86987431 has 2 divisors, whose sum is σ = 86987432. Its totient is φ = 86987430.

The previous prime is 86987429. The next prime is 86987447. The reversal of 86987431 is 13478968.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86987431 - 2¹ = 86987429 is a prime.

It is a super-2 number, since 2×86987431² = 15133626303959522, which contains 22 as substring.

Together with 86987429, 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 (86987401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43493715 + 43493716.

It is an arithmetic number, because the mean of its divisors is an integer number (43493716).

Almost surely, 2^86987431 is an apocalyptic number.

86987431 is a deficient number, since it is larger than the sum of its proper divisors (1).

86987431 is an equidigital number, since it uses as much as digits as its factorization.

86987431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 86987431 is about 9326.7052596295. The cubic root of 86987431 is about 443.0834225066.

It can be divided in two parts, 8698 and 7431, that added together give a square (16129 = 127²).

The spelling of 86987431 in words is "eighty-six million, nine hundred eighty-seven thousand, four hundred thirty-one".