13979261043225 has 81 divisors (see below), whose sum is σ = 25525173667357. Its totient is φ = 7313378704320.

The previous prime is 13979261043157. The next prime is 13979261043257. The reversal of 13979261043225 is 52234016297931.

It is a happy number.

The square root of 13979261043225 is 3738885.

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

13979261043225 is a `hidden beast` number, since 1 + 3 + 97 + 92 + 6 + 10 + 432 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 105304793049 + 13873956250176 = 324507^2 + 3724776^2 .

It is not a de Polignac number, because 13979261043225 - 2¹⁷ = 13979260912153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2972411224 + ... + 2972415926.

Almost surely, 2^{13979261043225} is an apocalyptic number.

13979261043225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13979261043225 is the 3738885-th square number.

13979261043225 is the 1869443-rd centered octagonal number.

It is an amenable number.

13979261043225 is a deficient number, since it is larger than the sum of its proper divisors (11545912624132).

13979261043225 is an frugal number, since it uses more digits than its factorization.

13979261043225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9528 (or 4764 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 13979261043225 in words is "thirteen trillion, nine hundred seventy-nine billion, two hundred sixty-one million, forty-three thousand, two hundred twenty-five".