86521831 has 8 divisors (see below), whose sum is σ = 94454928. Its totient is φ = 78600000.

The previous prime is 86521829. The next prime is 86521859. The reversal of 86521831 is 13812568.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86521831 - 2¹ = 86521829 is a prime.

It is a super-2 number, since 2×86521831² = 14972054479185122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86521861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27331 + ... + 30331.

It is an arithmetic number, because the mean of its divisors is an integer number (11806866).

Almost surely, 2^86521831 is an apocalyptic number.

86521831 is a deficient number, since it is larger than the sum of its proper divisors (7933097).

86521831 is a wasteful number, since it uses less digits than its factorization.

86521831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5633.

The product of its digits is 11520, while the sum is 34.

The square root of 86521831 is about 9301.7111866581. The cubic root of 86521831 is about 442.2914735613.

The spelling of 86521831 in words is "eighty-six million, five hundred twenty-one thousand, eight hundred thirty-one".