87994521 has 6 divisors (see below), whose sum is σ = 127103210. Its totient is φ = 58663008.

The previous prime is 87994519. The next prime is 87994531. The reversal of 87994521 is 12549978.

It can be written as a sum of positive squares in only one way, i.e., 60840000 + 27154521 = 7800^2 + 5211^2 .

It is not a de Polignac number, because 87994521 - 2¹ = 87994519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87994531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4888576 + ... + 4888593.

Almost surely, 2^87994521 is an apocalyptic number.

It is an amenable number.

87994521 is a deficient number, since it is larger than the sum of its proper divisors (39108689).

87994521 is a wasteful number, since it uses less digits than its factorization.

87994521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9777175 (or 9777172 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 87994521 is about 9380.5394834199. The cubic root of 87994521 is about 444.7867867201.

The spelling of 87994521 in words is "eighty-seven million, nine hundred ninety-four thousand, five hundred twenty-one".