15131613315131 has 4 divisors (see below), whose sum is σ = 15135304857000. Its totient is φ = 15127921773264.

The previous prime is 15131613315109. The next prime is 15131613315163. The reversal of 15131613315131 is 13151331613151.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15131613315131 is a prime.

It is a super-2 number, since 2×15131613315131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15131613315091 and 15131613315100.

It is not an unprimeable number, because it can be changed into a prime (15131613315631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1845764786 + ... + 1845772983.

It is an arithmetic number, because the mean of its divisors is an integer number (3783826214250).

Almost surely, 2^{15131613315131} is an apocalyptic number.

15131613315131 is a deficient number, since it is larger than the sum of its proper divisors (3691541869).

15131613315131 is an equidigital number, since it uses as much as digits as its factorization.

15131613315131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691541868.

The product of its digits is 12150, while the sum is 35.

Adding to 15131613315131 its reverse (13151331613151), we get a palindrome (28282944928282).

The spelling of 15131613315131 in words is "fifteen trillion, one hundred thirty-one billion, six hundred thirteen million, three hundred fifteen thousand, one hundred thirty-one".