131541731 has 4 divisors (see below), whose sum is σ = 138465000. Its totient is φ = 124618464.

The previous prime is 131541727. The next prime is 131541737. The reversal of 131541731 is 137145131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137145131 = 239 ⋅573829.

It is a cyclic number.

It is not a de Polignac number, because 131541731 - 2² = 131541727 is a prime.

It is a super-2 number, since 2×131541731² = 34606453988952722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131541731.

It is not an unprimeable number, because it can be changed into a prime (131541737) 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, 3461606 + ... + 3461643.

It is an arithmetic number, because the mean of its divisors is an integer number (34616250).

Almost surely, 2^131541731 is an apocalyptic number.

131541731 is a deficient number, since it is larger than the sum of its proper divisors (6923269).

131541731 is an equidigital number, since it uses as much as digits as its factorization.

131541731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6923268.

The product of its digits is 1260, while the sum is 26.

The square root of 131541731 is about 11469.1643549127. The cubic root of 131541731 is about 508.5744259093.

Adding to 131541731 its reverse (137145131), we get a palindrome (268686862).

The spelling of 131541731 in words is "one hundred thirty-one million, five hundred forty-one thousand, seven hundred thirty-one".