99621619 has 4 divisors (see below), whose sum is σ = 100648744. Its totient is φ = 98594496.

The previous prime is 99621593. The next prime is 99621629. The reversal of 99621619 is 91612699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91612699 = 19 ⋅4821721.

It is a cyclic number.

It is not a de Polignac number, because 99621619 - 2⁷ = 99621491 is a prime.

It is a super-2 number, since 2×99621619² = 19848933944362322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99621629) 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, 513417 + ... + 513610.

It is an arithmetic number, because the mean of its divisors is an integer number (25162186).

Almost surely, 2^99621619 is an apocalyptic number.

99621619 is a deficient number, since it is larger than the sum of its proper divisors (1027125).

99621619 is a wasteful number, since it uses less digits than its factorization.

99621619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027124.

The product of its digits is 52488, while the sum is 43.

The square root of 99621619 is about 9981.0630195386. The cubic root of 99621619 is about 463.5727137455.

The spelling of 99621619 in words is "ninety-nine million, six hundred twenty-one thousand, six hundred nineteen".