131512513749 has 4 divisors (see below), whose sum is σ = 175350018336. Its totient is φ = 87675009164.

The previous prime is 131512513729. The next prime is 131512513751. The reversal of 131512513749 is 947315215131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131512513749 - 2⁸ = 131512513493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131512513749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131512513729) 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, 21918752289 + ... + 21918752294.

It is an arithmetic number, because the mean of its divisors is an integer number (43837504584).

Almost surely, 2^131512513749 is an apocalyptic number.

It is an amenable number.

131512513749 is a deficient number, since it is larger than the sum of its proper divisors (43837504587).

131512513749 is an equidigital number, since it uses as much as digits as its factorization.

131512513749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43837504586.

The product of its digits is 113400, while the sum is 42.

The spelling of 131512513749 in words is "one hundred thirty-one billion, five hundred twelve million, five hundred thirteen thousand, seven hundred forty-nine".