99131781904 has 15 divisors (see below), whose sum is σ = 192070267573. Its totient is φ = 49565261248.

The previous prime is 99131781871. The next prime is 99131781923. The reversal of 99131781904 is 40918713199.

The square root of 99131781904 is 314852.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 67464867600 + 31666914304 = 259740^2 + 177952^2 .

It is a super-2 number, since 2×99131781904² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1220052 + ... + 1298764.

Almost surely, 2^99131781904 is an apocalyptic number.

99131781904 is the 314852-nd square number.

It is an amenable number.

99131781904 is a deficient number, since it is larger than the sum of its proper divisors (92938485669).

99131781904 is an frugal number, since it uses more digits than its factorization.

99131781904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157434 (or 78715 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 52.

The spelling of 99131781904 in words is "ninety-nine billion, one hundred thirty-one million, seven hundred eighty-one thousand, nine hundred four".