13129951396 has 81 divisors (see below), whose sum is σ = 25013592961. Its totient is φ = 6029973664.

The previous prime is 13129951381. The next prime is 13129951399. The reversal of 13129951396 is 69315992131.

It is a happy number.

The square root of 13129951396 is 114586.

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., 9465344100 + 3664607296 = 97290^2 + 60536^2 .

It is a super-2 number, since 2×13129951396² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13129951399) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 247734906 + ... + 247734958.

Almost surely, 2^13129951396 is an apocalyptic number.

13129951396 is the 114586-th square number.

It is an amenable number.

13129951396 is a deficient number, since it is larger than the sum of its proper divisors (11883641565).

13129951396 is an equidigital number, since it uses as much as digits as its factorization.

13129951396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 125 counting only the distinct ones).

The product of its digits is 393660, while the sum is 49.

Multiplying 13129951396 by its sum of digits (49), we get a square (643367618404 = 802102²).

The spelling of 13129951396 in words is "thirteen billion, one hundred twenty-nine million, nine hundred fifty-one thousand, three hundred ninety-six".