99992521 has 4 divisors (see below), whose sum is σ = 105874452. Its totient is φ = 94110592.

The previous prime is 99992509. The next prime is 99992527. The reversal of 99992521 is 12529999.

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 49070025 + 50922496 = 7005^2 + 7136^2 .

It is a cyclic number.

It is not a de Polignac number, because 99992521 - 2¹³ = 99984329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99992527) 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, 2940940 + ... + 2940973.

It is an arithmetic number, because the mean of its divisors is an integer number (26468613).

Almost surely, 2^99992521 is an apocalyptic number.

It is an amenable number.

99992521 is a deficient number, since it is larger than the sum of its proper divisors (5881931).

99992521 is a wasteful number, since it uses less digits than its factorization.

99992521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5881930.

The product of its digits is 131220, while the sum is 46.

The square root of 99992521 is about 9999.6260430078. The cubic root of 99992521 is about 464.1473115918.

The spelling of 99992521 in words is "ninety-nine million, nine hundred ninety-two thousand, five hundred twenty-one".