86128551 has 12 divisors (see below), whose sum is σ = 126755928. Its totient is φ = 56335344.

The previous prime is 86128547. The next prime is 86128561. The reversal of 86128551 is 15582168.

86128551 is a `hidden beast` number, since 86 + 1 + 28 + 551 = 666.

It is not a de Polignac number, because 86128551 - 2² = 86128547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86128541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89805 + ... + 90758.

It is an arithmetic number, because the mean of its divisors is an integer number (10562994).

Almost surely, 2^86128551 is an apocalyptic number.

86128551 is a deficient number, since it is larger than the sum of its proper divisors (40627377).

86128551 is a wasteful number, since it uses less digits than its factorization.

86128551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180622 (or 180619 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 86128551 is about 9280.5469127633. The cubic root of 86128551 is about 441.6203188262.

The spelling of 86128551 in words is "eighty-six million, one hundred twenty-eight thousand, five hundred fifty-one".