87510961 has 4 divisors (see below), whose sum is σ = 87653412. Its totient is φ = 87368512.

The previous prime is 87510953. The next prime is 87510991. The reversal of 87510961 is 16901578.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39125025 + 48385936 = 6255^2 + 6956^2 .

It is a cyclic number.

It is not a de Polignac number, because 87510961 - 2³ = 87510953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87510961.

It is not an unprimeable number, because it can be changed into a prime (87510991) 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, 70300 + ... + 71533.

It is an arithmetic number, because the mean of its divisors is an integer number (21913353).

Almost surely, 2^87510961 is an apocalyptic number.

It is an amenable number.

87510961 is a deficient number, since it is larger than the sum of its proper divisors (142451).

87510961 is a wasteful number, since it uses less digits than its factorization.

87510961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142450.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 87510961 is about 9354.7293386821. The cubic root of 87510961 is about 443.9705378416.

The spelling of 87510961 in words is "eighty-seven million, five hundred ten thousand, nine hundred sixty-one".