99577221 has 4 divisors (see below), whose sum is σ = 132769632. Its totient is φ = 66384812.

The previous prime is 99577187. The next prime is 99577241. The reversal of 99577221 is 12277599.

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 not a de Polignac number, because 99577221 - 2⁹ = 99576709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99577241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16596201 + ... + 16596206.

It is an arithmetic number, because the mean of its divisors is an integer number (33192408).

Almost surely, 2^99577221 is an apocalyptic number.

It is an amenable number.

99577221 is a deficient number, since it is larger than the sum of its proper divisors (33192411).

99577221 is a wasteful number, since it uses less digits than its factorization.

99577221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33192410.

The product of its digits is 79380, while the sum is 42.

The square root of 99577221 is about 9978.8386598842. The cubic root of 99577221 is about 463.5038372645.

The spelling of 99577221 in words is "ninety-nine million, five hundred seventy-seven thousand, two hundred twenty-one".