131212913 has 4 divisors (see below), whose sum is σ = 141306228. Its totient is φ = 121119600.

The previous prime is 131212903. The next prime is 131212931. The reversal of 131212913 is 319212131.

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 64513024 + 66699889 = 8032^2 + 8167^2 .

It is a cyclic number.

It is not a de Polignac number, because 131212913 - 2⁸ = 131212657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131212903) 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, 5046638 + ... + 5046663.

It is an arithmetic number, because the mean of its divisors is an integer number (35326557).

Almost surely, 2^131212913 is an apocalyptic number.

131212913 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

131212913 is a deficient number, since it is larger than the sum of its proper divisors (10093315).

131212913 is a wasteful number, since it uses less digits than its factorization.

131212913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10093314.

The product of its digits is 324, while the sum is 23.

The square root of 131212913 is about 11454.8205136528. The cubic root of 131212913 is about 508.1503071151.

The spelling of 131212913 in words is "one hundred thirty-one million, two hundred twelve thousand, nine hundred thirteen".