87165081 has 12 divisors (see below), whose sum is σ = 129308452. Its totient is φ = 56539296.

The previous prime is 87165079. The next prime is 87165131. The reversal of 87165081 is 18056178.

It can be written as a sum of positive squares in 2 ways, for example, as 57517056 + 29648025 = 7584^2 + 5445^2 .

It is not a de Polignac number, because 87165081 - 2¹ = 87165079 is a prime.

It is a super-2 number, since 2×87165081² = 15195502691473122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87165031) 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, 130546 + ... + 131211.

Almost surely, 2^87165081 is an apocalyptic number.

It is an amenable number.

87165081 is a deficient number, since it is larger than the sum of its proper divisors (42143371).

87165081 is a wasteful number, since it uses less digits than its factorization.

87165081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261800 (or 261797 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 87165081 is about 9336.2241297004. The cubic root of 87165081 is about 443.3848463079.

The spelling of 87165081 in words is "eighty-seven million, one hundred sixty-five thousand, eighty-one".