99523121 has 4 divisors (see below), whose sum is σ = 104761200. Its totient is φ = 94285044.

The previous prime is 99523103. The next prime is 99523129. The reversal of 99523121 is 12132599.

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 a de Polignac number, because none of the positive numbers 2^k-99523121 is a prime.

It is a super-2 number, since 2×99523121² = 19809703227161282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99523129) 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, 2619011 + ... + 2619048.

It is an arithmetic number, because the mean of its divisors is an integer number (26190300).

Almost surely, 2^99523121 is an apocalyptic number.

It is an amenable number.

99523121 is a deficient number, since it is larger than the sum of its proper divisors (5238079).

99523121 is a wasteful number, since it uses less digits than its factorization.

99523121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238078.

The product of its digits is 4860, while the sum is 32.

The square root of 99523121 is about 9976.1275553192. The cubic root of 99523121 is about 463.4198819855.

The spelling of 99523121 in words is "ninety-nine million, five hundred twenty-three thousand, one hundred twenty-one".