99261521 has 4 divisors (see below), whose sum is σ = 105100452. Its totient is φ = 93422592.

The previous prime is 99261499. The next prime is 99261551. The reversal of 99261521 is 12516299.

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 75603025 + 23658496 = 8695^2 + 4864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99261521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99261551) 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, 2919440 + ... + 2919473.

It is an arithmetic number, because the mean of its divisors is an integer number (26275113).

Almost surely, 2^99261521 is an apocalyptic number.

It is an amenable number.

99261521 is a deficient number, since it is larger than the sum of its proper divisors (5838931).

99261521 is a wasteful number, since it uses less digits than its factorization.

99261521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5838930.

The product of its digits is 9720, while the sum is 35.

The square root of 99261521 is about 9963.0076282215. The cubic root of 99261521 is about 463.0134872538.

The spelling of 99261521 in words is "ninety-nine million, two hundred sixty-one thousand, five hundred twenty-one".