131515751 has 4 divisors (see below), whose sum is σ = 131538792. Its totient is φ = 131492712.

The previous prime is 131515721. The next prime is 131515763. The reversal of 131515751 is 157515131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 157515131 = 229 ⋅687839.

It is a cyclic number.

It is not a de Polignac number, because 131515751 - 2¹⁰ = 131514727 is a prime.

It is a super-2 number, since 2×131515751² = 34592785522188002, which 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 (131515711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4121 + ... + 16733.

It is an arithmetic number, because the mean of its divisors is an integer number (32884698).

Almost surely, 2^131515751 is an apocalyptic number.

131515751 is a deficient number, since it is larger than the sum of its proper divisors (23041).

131515751 is a wasteful number, since it uses less digits than its factorization.

131515751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23040.

The product of its digits is 2625, while the sum is 29.

The square root of 131515751 is about 11468.0316968519. The cubic root of 131515751 is about 508.5409419003.

The spelling of 131515751 in words is "one hundred thirty-one million, five hundred fifteen thousand, seven hundred fifty-one".