99587521 has 4 divisors (see below), whose sum is σ = 108640944. Its totient is φ = 90534100.

The previous prime is 99587497. The next prime is 99587533. The reversal of 99587521 is 12578599.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99587521 - 2⁹ = 99587009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99587021) 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, 4526695 + ... + 4526716.

It is an arithmetic number, because the mean of its divisors is an integer number (27160236).

Almost surely, 2^99587521 is an apocalyptic number.

It is an amenable number.

99587521 is a deficient number, since it is larger than the sum of its proper divisors (9053423).

99587521 is a wasteful number, since it uses less digits than its factorization.

99587521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9053422.

The product of its digits is 226800, while the sum is 46.

The square root of 99587521 is about 9979.3547386592. The cubic root of 99587521 is about 463.5198179104.

The spelling of 99587521 in words is "ninety-nine million, five hundred eighty-seven thousand, five hundred twenty-one".