15504981361 has 9 divisors (see below), whose sum is σ = 15600069643. Its totient is φ = 15410471440.

The previous prime is 15504981337. The next prime is 15504981391. The reversal of 15504981361 is 16318940551.

The square root of 15504981361 is 124519.

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., 4446355761 + 11058625600 = 66681^2 + 105160^2 .

It is a de Polignac number, because none of the positive numbers 2^k-15504981361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15504981311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 29759781 + ... + 29760301.

Almost surely, 2^15504981361 is an apocalyptic number.

15504981361 is the 124519-th square number.

15504981361 is the 62260-th centered octagonal number.

It is an amenable number.

15504981361 is a deficient number, since it is larger than the sum of its proper divisors (95088282).

15504981361 is an frugal number, since it uses more digits than its factorization.

15504981361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 15504981361 in words is "fifteen billion, five hundred four million, nine hundred eighty-one thousand, three hundred sixty-one".