99181572 has 24 divisors (see below), whose sum is σ = 264484416. Its totient is φ = 28337568.

The previous prime is 99181531. The next prime is 99181601. The reversal of 99181572 is 27518199.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590283 + ... + 590450.

It is an arithmetic number, because the mean of its divisors is an integer number (11020184).

Almost surely, 2^99181572 is an apocalyptic number.

It is an amenable number.

99181572 is an abundant number, since it is smaller than the sum of its proper divisors (165302844).

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

99181572 is a wasteful number, since it uses less digits than its factorization.

99181572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180747 (or 1180745 counting only the distinct ones).

The product of its digits is 45360, while the sum is 42.

The square root of 99181572 is about 9958.9945275615. The cubic root of 99181572 is about 462.8891443134.

The spelling of 99181572 in words is "ninety-nine million, one hundred eighty-one thousand, five hundred seventy-two".