15440796121 has 9 divisors (see below), whose sum is σ = 15529401981. Its totient is φ = 15352695072.

The previous prime is 15440796113. The next prime is 15440796127. The reversal of 15440796121 is 12169704451.

It is a happy number.

The square root of 15440796121 is 124261.

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

It can be written as a sum of positive squares in 4 ways, for example, as 3970386121 + 11470410000 = 63011^2 + 107100^2 .

It is not a de Polignac number, because 15440796121 - 2³ = 15440796113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15440796127) 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, 38893495 + ... + 38893891.

It is an arithmetic number, because the mean of its divisors is an integer number (1725489109).

Almost surely, 2^15440796121 is an apocalyptic number.

15440796121 is the 124261-st square number.

15440796121 is the 62131-st centered octagonal number.

It is an amenable number.

15440796121 is a deficient number, since it is larger than the sum of its proper divisors (88605860).

15440796121 is an frugal number, since it uses more digits than its factorization.

15440796121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 15440796121 in words is "fifteen billion, four hundred forty million, seven hundred ninety-six thousand, one hundred twenty-one".