87171265 has 12 divisors (see below), whose sum is σ = 109354644. Its totient is φ = 66702944.

The previous prime is 87171263. The next prime is 87171283. The reversal of 87171265 is 56217178.

It can be written as a sum of positive squares in 2 ways, for example, as 64064016 + 23107249 = 8004^2 + 4807^2 .

It is not a de Polignac number, because 87171265 - 2¹ = 87171263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87171263) 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, 13834 + ... + 19123.

It is an arithmetic number, because the mean of its divisors is an integer number (9112887).

Almost surely, 2^87171265 is an apocalyptic number.

It is an amenable number.

87171265 is a deficient number, since it is larger than the sum of its proper divisors (22183379).

87171265 is a wasteful number, since it uses less digits than its factorization.

87171265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33008 (or 32985 counting only the distinct ones).

The product of its digits is 23520, while the sum is 37.

The square root of 87171265 is about 9336.5553069641. Note that the first 3 decimals coincide. The cubic root of 87171265 is about 443.3953314969.

The spelling of 87171265 in words is "eighty-seven million, one hundred seventy-one thousand, two hundred sixty-five".