86551391 has 4 divisors (see below), whose sum is σ = 86631672. Its totient is φ = 86471112.

The previous prime is 86551379. The next prime is 86551417. The reversal of 86551391 is 19315568.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86551391 is a prime.

It is a super-2 number, since 2×86551391² = 14982286568069762, 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 (86551331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38501 + ... + 40686.

It is an arithmetic number, because the mean of its divisors is an integer number (21657918).

Almost surely, 2^86551391 is an apocalyptic number.

86551391 is a deficient number, since it is larger than the sum of its proper divisors (80281).

86551391 is a wasteful number, since it uses less digits than its factorization.

86551391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80280.

The product of its digits is 32400, while the sum is 38.

The square root of 86551391 is about 9303.3000059119. The cubic root of 86551391 is about 442.3418371407.

The spelling of 86551391 in words is "eighty-six million, five hundred fifty-one thousand, three hundred ninety-one".