99479621 has 4 divisors (see below), whose sum is σ = 99664044. Its totient is φ = 99295200.

The previous prime is 99479609. The next prime is 99479629. The reversal of 99479621 is 12697499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12697499 = 3217 ⋅3947.

It can be written as a sum of positive squares in 2 ways, for example, as 20802721 + 78676900 = 4561^2 + 8870^2 .

It is a cyclic number.

It is not a de Polignac number, because 99479621 - 2⁶ = 99479557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99479629) 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, 91400 + ... + 92481.

It is an arithmetic number, because the mean of its divisors is an integer number (24916011).

Almost surely, 2^99479621 is an apocalyptic number.

It is an amenable number.

99479621 is a deficient number, since it is larger than the sum of its proper divisors (184423).

99479621 is a wasteful number, since it uses less digits than its factorization.

99479621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184422.

The product of its digits is 244944, while the sum is 47.

The square root of 99479621 is about 9973.9471123523. The cubic root of 99479621 is about 463.3523542847.

The spelling of 99479621 in words is "ninety-nine million, four hundred seventy-nine thousand, six hundred twenty-one".