99072521 has 2 divisors, whose sum is σ = 99072522. Its totient is φ = 99072520.

The previous prime is 99072503. The next prime is 99072527. The reversal of 99072521 is 12527099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96746896 + 2325625 = 9836^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 99072521 - 2¹⁴ = 99056137 is a prime.

It is not a weakly prime, because it can be changed into another prime (99072527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49536260 + 49536261.

It is an arithmetic number, because the mean of its divisors is an integer number (49536261).

Almost surely, 2^99072521 is an apocalyptic number.

It is an amenable number.

99072521 is a deficient number, since it is larger than the sum of its proper divisors (1).

99072521 is an equidigital number, since it uses as much as digits as its factorization.

99072521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 99072521 is about 9953.5180212827. The cubic root of 99072521 is about 462.7194318864.

The spelling of 99072521 in words is "ninety-nine million, seventy-two thousand, five hundred twenty-one".