86971431 has 4 divisors (see below), whose sum is σ = 115961912. Its totient is φ = 57980952.

The previous prime is 86971393. The next prime is 86971459. The reversal of 86971431 is 13417968.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 86971431 - 2²² = 82777127 is a prime.

It is a super-2 number, since 2×86971431² = 15128059620375522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86971431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86971481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14495236 + ... + 14495241.

It is an arithmetic number, because the mean of its divisors is an integer number (28990478).

Almost surely, 2^86971431 is an apocalyptic number.

86971431 is a deficient number, since it is larger than the sum of its proper divisors (28990481).

86971431 is a wasteful number, since it uses less digits than its factorization.

86971431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28990480.

The product of its digits is 36288, while the sum is 39.

The square root of 86971431 is about 9325.8474681929. The cubic root of 86971431 is about 443.0562547140.

The spelling of 86971431 in words is "eighty-six million, nine hundred seventy-one thousand, four hundred thirty-one".