13131231989 has 4 divisors (see below), whose sum is σ = 13131977100. Its totient is φ = 13130486880.

The previous prime is 13131231931. The next prime is 13131232007. The reversal of 13131231989 is 98913213131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4547209489 + 8584022500 = 67433^2 + 92650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13131231989 is a prime.

It is a super-2 number, since 2×13131231989² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131231389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345464 + ... + 381585.

It is an arithmetic number, because the mean of its divisors is an integer number (3282994275).

Almost surely, 2^13131231989 is an apocalyptic number.

It is an amenable number.

13131231989 is a deficient number, since it is larger than the sum of its proper divisors (745111).

13131231989 is an equidigital number, since it uses as much as digits as its factorization.

13131231989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745110.

The product of its digits is 34992, while the sum is 41.

The spelling of 13131231989 in words is "thirteen billion, one hundred thirty-one million, two hundred thirty-one thousand, nine hundred eighty-nine".