87605521 has 2 divisors, whose sum is σ = 87605522. Its totient is φ = 87605520.

The previous prime is 87605477. The next prime is 87605533. The reversal of 87605521 is 12550678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62964225 + 24641296 = 7935^2 + 4964^2 .

It is a cyclic number.

It is not a de Polignac number, because 87605521 - 2⁹ = 87605009 is a prime.

It is not a weakly prime, because it can be changed into another prime (87605591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43802760 + 43802761.

It is an arithmetic number, because the mean of its divisors is an integer number (43802761).

Almost surely, 2^87605521 is an apocalyptic number.

It is an amenable number.

87605521 is a deficient number, since it is larger than the sum of its proper divisors (1).

87605521 is an equidigital number, since it uses as much as digits as its factorization.

87605521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 87605521 is about 9359.7821021646. The cubic root of 87605521 is about 444.1303911197.

The spelling of 87605521 in words is "eighty-seven million, six hundred five thousand, five hundred twenty-one".