86166531 has 32 divisors (see below), whose sum is σ = 139991040. Its totient is φ = 51948000.

The previous prime is 86166473. The next prime is 86166547. The reversal of 86166531 is 13566168.

It is a happy number.

86166531 is a `hidden beast` number, since 8 + 61 + 66 + 531 = 666.

It is not a de Polignac number, because 86166531 - 2¹³ = 86158339 is a prime.

It is a super-2 number, since 2×86166531² = 14849342129147922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86166331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65581 + ... + 66881.

It is an arithmetic number, because the mean of its divisors is an integer number (4374720).

Almost surely, 2^86166531 is an apocalyptic number.

86166531 is a deficient number, since it is larger than the sum of its proper divisors (53824509).

86166531 is a wasteful number, since it uses less digits than its factorization.

86166531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544 (or 1538 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 86166531 is about 9282.5929028478. The cubic root of 86166531 is about 441.6852228745.

The spelling of 86166531 in words is "eighty-six million, one hundred sixty-six thousand, five hundred thirty-one".