11980131538 has 4 divisors (see below), whose sum is σ = 17970197310. Its totient is φ = 5990065768.

The previous prime is 11980131517. The next prime is 11980131589. The reversal of 11980131538 is 83513108911.

11980131538 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., 8644722529 + 3335409009 = 92977^2 + 57753^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 11980131538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2995032883 + ... + 2995032886.

Almost surely, 2^11980131538 is an apocalyptic number.

11980131538 is a deficient number, since it is larger than the sum of its proper divisors (5990065772).

11980131538 is an equidigital number, since it uses as much as digits as its factorization.

11980131538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5990065771.

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 11980131538 in words is "eleven billion, nine hundred eighty million, one hundred thirty-one thousand, five hundred thirty-eight".