99959521 has 2 divisors, whose sum is σ = 99959522. Its totient is φ = 99959520.

The previous prime is 99959467. The next prime is 99959591. The reversal of 99959521 is 12595999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88830625 + 11128896 = 9425^2 + 3336^2 .

It is a cyclic number.

It is not a de Polignac number, because 99959521 - 2¹⁵ = 99926753 is a prime.

It is not a weakly prime, because it can be changed into another prime (99959591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49979760 + 49979761.

It is an arithmetic number, because the mean of its divisors is an integer number (49979761).

Almost surely, 2^99959521 is an apocalyptic number.

It is an amenable number.

99959521 is a deficient number, since it is larger than the sum of its proper divisors (1).

99959521 is an equidigital number, since it uses as much as digits as its factorization.

99959521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 328050, while the sum is 49.

The square root of 99959521 is about 9997.9758451399. The cubic root of 99959521 is about 464.0962459507.

The spelling of 99959521 in words is "ninety-nine million, nine hundred fifty-nine thousand, five hundred twenty-one".