15504441121 has 8 divisors (see below), whose sum is σ = 16737920360. Its totient is φ = 14276794752.

The previous prime is 15504441101. The next prime is 15504441137. The reversal of 15504441121 is 12114440551.

It can be written as a sum of positive squares in 4 ways, for example, as 5592048400 + 9912392721 = 74780^2 + 99561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15504441121 - 2⁵ = 15504441089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15504441121.

It is not an unprimeable number, because it can be changed into a prime (15504441101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1452690 + ... + 1463323.

It is an arithmetic number, because the mean of its divisors is an integer number (2092240045).

Almost surely, 2^15504441121 is an apocalyptic number.

It is an amenable number.

15504441121 is a deficient number, since it is larger than the sum of its proper divisors (1233479239).

15504441121 is a wasteful number, since it uses less digits than its factorization.

15504441121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916435.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 15504441121 its reverse (12114440551), we get a palindrome (27618881672).

The spelling of 15504441121 in words is "fifteen billion, five hundred four million, four hundred forty-one thousand, one hundred twenty-one".