99999522 has 80 divisors (see below), whose sum is σ = 258130752. Its totient is φ = 28343520.

The previous prime is 99999517. The next prime is 99999539. The reversal of 99999522 is 22599999.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nialpdrome in base 10.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 184572 + ... + 185112.

Almost surely, 2^99999522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99999522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129065376).

99999522 is an abundant number, since it is smaller than the sum of its proper divisors (158131230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999522 is a wasteful number, since it uses less digits than its factorization.

99999522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 716 counting only the distinct ones).

The product of its digits is 1180980, while the sum is 54.

The square root of 99999522 is about 9999.9760999714. The cubic root of 99999522 is about 464.1581438003.

The spelling of 99999522 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred twenty-two".