87565181 has 32 divisors (see below), whose sum is σ = 106634880. Its totient is φ = 70963200.

The previous prime is 87565171. The next prime is 87565201. The reversal of 87565181 is 18156578.

It is not a de Polignac number, because 87565181 - 2²² = 83370877 is a prime.

It is a super-2 number, since 2×87565181² = 15335321847125522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87565171) 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, 363221 + ... + 363461.

It is an arithmetic number, because the mean of its divisors is an integer number (3332340).

Almost surely, 2^87565181 is an apocalyptic number.

It is an amenable number.

87565181 is a deficient number, since it is larger than the sum of its proper divisors (19069699).

87565181 is a wasteful number, since it uses less digits than its factorization.

87565181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

The product of its digits is 67200, while the sum is 41.

The square root of 87565181 is about 9357.6268893347. The cubic root of 87565181 is about 444.0622105969.

The spelling of 87565181 in words is "eighty-seven million, five hundred sixty-five thousand, one hundred eighty-one".