15109080561 has 9 divisors (see below), whose sum is σ = 21824760139. Its totient is φ = 10072474536.

The previous prime is 15109080541. The next prime is 15109080563. The reversal of 15109080561 is 16508090151.

The square root of 15109080561 is 122919.

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

15109080561 is a `hidden beast` number, since 1 + 5 + 1 + 0 + 90 + 8 + 0 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14860829025 + 248251536 = 121905^2 + 15756^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 15109080561 - 2⁵ = 15109080529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15109080563) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 348271 + ... + 389243.

Almost surely, 2^15109080561 is an apocalyptic number.

15109080561 is the 122919-th square number.

15109080561 is the 61460-th centered octagonal number.

It is an amenable number.

15109080561 is a deficient number, since it is larger than the sum of its proper divisors (6715679578).

15109080561 is an frugal number, since it uses more digits than its factorization.

15109080561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81952 (or 40976 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

Multiplying 15109080561 by its sum of digits (36), we get a square (543926900196 = 737514²).

The spelling of 15109080561 in words is "fifteen billion, one hundred nine million, eighty thousand, five hundred sixty-one".