131255531 has 4 divisors (see below), whose sum is σ = 143187864. Its totient is φ = 119323200.

The previous prime is 131255513. The next prime is 131255543. The reversal of 131255531 is 135552131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 131255531 - 2¹⁰ = 131254507 is a prime.

It is a super-2 number, since 2×131255531² = 34456028836183922, 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 131255531.

It is not an unprimeable number, because it can be changed into a prime (131255561) 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, 5966150 + ... + 5966171.

It is an arithmetic number, because the mean of its divisors is an integer number (35796966).

Almost surely, 2^131255531 is an apocalyptic number.

131255531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131255531 is a deficient number, since it is larger than the sum of its proper divisors (11932333).

131255531 is a wasteful number, since it uses less digits than its factorization.

131255531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11932332.

The product of its digits is 2250, while the sum is 26.

The square root of 131255531 is about 11456.6806274767. The cubic root of 131255531 is about 508.2053169589.

The spelling of 131255531 in words is "one hundred thirty-one million, two hundred fifty-five thousand, five hundred thirty-one".