99563621 has 16 divisors (see below), whose sum is σ = 105235200. Its totient is φ = 94099200.

The previous prime is 99563609. The next prime is 99563623. The reversal of 99563621 is 12636599.

It is a cyclic number.

It is not a de Polignac number, because 99563621 - 2²⁶ = 32454757 is a prime.

It is a super-3 number, since 3×99563621³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99563623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190841 + ... + 191361.

It is an arithmetic number, because the mean of its divisors is an integer number (6577200).

Almost surely, 2^99563621 is an apocalyptic number.

It is an amenable number.

99563621 is a deficient number, since it is larger than the sum of its proper divisors (5671579).

99563621 is a wasteful number, since it uses less digits than its factorization.

99563621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its digits is 87480, while the sum is 41.

The square root of 99563621 is about 9978.1571945926. The cubic root of 99563621 is about 463.4827349176.

The spelling of 99563621 in words is "ninety-nine million, five hundred sixty-three thousand, six hundred twenty-one".