13139428777225 has 9 divisors (see below), whose sum is σ = 16292914157767. Its totient is φ = 10511528522440.

The previous prime is 13139428777183. The next prime is 13139428777249. The reversal of 13139428777225 is 52277782493131.

It is a happy number.

The square root of 13139428777225 is 3624835.

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., 4730194359801 + 8409234417424 = 2174901^2 + 2899868^2 .

It is not a de Polignac number, because 13139428777225 - 2¹⁵ = 13139428744457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17761692 + ... + 18486658.

Almost surely, 2^{13139428777225} is an apocalyptic number.

13139428777225 is the 3624835-th square number.

13139428777225 is the 1812418-th centered octagonal number.

It is an amenable number.

13139428777225 is a deficient number, since it is larger than the sum of its proper divisors (3153485380542).

13139428777225 is an frugal number, since it uses more digits than its factorization.

13139428777225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449944 (or 724972 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 61.

The spelling of 13139428777225 in words is "thirteen trillion, one hundred thirty-nine billion, four hundred twenty-eight million, seven hundred seventy-seven thousand, two hundred twenty-five".