99999557 has 8 divisors (see below), whose sum is σ = 116159232. Its totient is φ = 84308400.

The previous prime is 99999551. The next prime is 99999563. The reversal of 99999557 is 75599999.

It is an interprime number because it is at equal distance from previous prime (99999551) and next prime (99999563).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99999557 - 2⁴ = 99999541 is a prime.

It is a super-2 number, since 2×99999557² = 19999822800392498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99999557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116669 + ... + 117522.

It is an arithmetic number, because the mean of its divisors is an integer number (14519904).

Almost surely, 2^99999557 is an apocalyptic number.

It is an amenable number.

99999557 is a deficient number, since it is larger than the sum of its proper divisors (16159675).

99999557 is a wasteful number, since it uses less digits than its factorization.

99999557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234259.

The product of its digits is 10333575, while the sum is 62.

The square root of 99999557 is about 9999.9778499755. The cubic root of 99999557 is about 464.1581979523.

The spelling of 99999557 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred fifty-seven".