86447287531 has 4 divisors (see below), whose sum is σ = 94306131864. Its totient is φ = 78588443200.

The previous prime is 86447287513. The next prime is 86447287547. The reversal of 86447287531 is 13578274468.

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

It is a cyclic number.

It is not a de Polignac number, because 86447287531 - 2⁵ = 86447287499 is a prime.

It is a super-2 number, since 2×86447287531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86447287561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3929422150 + ... + 3929422171.

It is an arithmetic number, because the mean of its divisors is an integer number (23576532966).

Almost surely, 2^86447287531 is an apocalyptic number.

86447287531 is a deficient number, since it is larger than the sum of its proper divisors (7858844333).

86447287531 is a wasteful number, since it uses less digits than its factorization.

86447287531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7858844332.

The product of its digits is 9031680, while the sum is 55.

The spelling of 86447287531 in words is "eighty-six billion, four hundred forty-seven million, two hundred eighty-seven thousand, five hundred thirty-one".