12991896324 has 135 divisors (see below), whose sum is σ = 36356022885. Its totient is φ = 3911862240.

The previous prime is 12991896317. The next prime is 12991896331. The reversal of 12991896324 is 42369819921.

The square root of 12991896324 is 113982.

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

It is an interprime number because it is at equal distance from previous prime (12991896317) and next prime (12991896331).

It can be written as a sum of positive squares in only one way, i.e., 3808124100 + 9183772224 = 61710^2 + 95832^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 82750854 + ... + 82751010.

Almost surely, 2^12991896324 is an apocalyptic number.

12991896324 is the 113982-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12991896324

12991896324 is an abundant number, since it is smaller than the sum of its proper divisors (23364126561).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12991896324 is an equidigital number, since it uses as much as digits as its factorization.

12991896324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 173 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The spelling of 12991896324 in words is "twelve billion, nine hundred ninety-one million, eight hundred ninety-six thousand, three hundred twenty-four".