86557 has 4 divisors (see below), whose sum is σ = 87516. Its totient is φ = 85600.

The previous prime is 86539. The next prime is 86561. The reversal of 86557 is 75568.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 81796 + 4761 = 286^2 + 69^2 .

It is a cyclic number.

It is not a de Polignac number, because 86557 - 2¹¹ = 84509 is a prime.

It is a super-2 number, since 2×86557² = 14984228498, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86587) 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, 328 + ... + 529.

It is an arithmetic number, because the mean of its divisors is an integer number (21879).

2⁸⁶⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

86557 is a deficient number, since it is larger than the sum of its proper divisors (959).

86557 is a wasteful number, since it uses less digits than its factorization.

86557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958.

The product of its digits is 8400, while the sum is 31.

The square root of 86557 is about 294.2057103457. The cubic root of 86557 is about 44.2351392318.

The spelling of 86557 in words is "eighty-six thousand, five hundred fifty-seven".