12981139154 has 4 divisors (see below), whose sum is σ = 19471708734. Its totient is φ = 6490569576.

The previous prime is 12981139147. The next prime is 12981139183. The reversal of 12981139154 is 45193118921.

12981139154 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10790431129 + 2190708025 = 103877^2 + 46805^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3245284787 + ... + 3245284790.

Almost surely, 2^12981139154 is an apocalyptic number.

12981139154 is a deficient number, since it is larger than the sum of its proper divisors (6490569580).

12981139154 is an equidigital number, since it uses as much as digits as its factorization.

12981139154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6490569579.

The product of its digits is 77760, while the sum is 44.

The spelling of 12981139154 in words is "twelve billion, nine hundred eighty-one million, one hundred thirty-nine thousand, one hundred fifty-four".