99999619 has 4 divisors (see below), whose sum is σ = 100044000. Its totient is φ = 99955240.

The previous prime is 99999617. The next prime is 99999623. The reversal of 99999619 is 91699999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91699999 = 4079 ⋅22481.

It is a cyclic number.

It is not a de Polignac number, because 99999619 - 2¹ = 99999617 is a prime.

It is a super-2 number, since 2×99999619² = 19999847600290322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999611) 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, 18619 + ... + 23380.

It is an arithmetic number, because the mean of its divisors is an integer number (25011000).

Almost surely, 2^99999619 is an apocalyptic number.

99999619 is a deficient number, since it is larger than the sum of its proper divisors (44381).

99999619 is a wasteful number, since it uses less digits than its factorization.

99999619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44380.

The product of its digits is 3188646, while the sum is 61.

The square root of 99999619 is about 9999.9809499819. The cubic root of 99999619 is about 464.1582938787.

The spelling of 99999619 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred nineteen".