13131231994 has 8 divisors (see below), whose sum is σ = 20229195348. Its totient is φ = 6388166880.

The previous prime is 13131231931. The next prime is 13131232007. The reversal of 13131231994 is 49913213131.

It can be written as a sum of positive squares in 2 ways, for example, as 9032031369 + 4099200625 = 95037^2 + 64025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88724467 + ... + 88724614.

Almost surely, 2^13131231994 is an apocalyptic number.

13131231994 is a deficient number, since it is larger than the sum of its proper divisors (7097963354).

13131231994 is a wasteful number, since it uses less digits than its factorization.

13131231994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177449120.

The product of its digits is 17496, while the sum is 37.

It can be divided in two parts, 131312 and 31994, that added together give a triangular number (163306 = T₅₇₁).

The spelling of 13131231994 in words is "thirteen billion, one hundred thirty-one million, two hundred thirty-one thousand, nine hundred ninety-four".