131555724531 has 64 divisors (see below), whose sum is σ = 220597641216. Its totient is φ = 67745952000.

The previous prime is 131555724529. The next prime is 131555724533. The reversal of 131555724531 is 135427555131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (131555724529) and next prime (131555724533).

It is not a de Polignac number, because 131555724531 - 2¹ = 131555724529 is a prime.

It is a super-2 number, since 2×131555724531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131555724533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26042956 + ... + 26048006.

It is an arithmetic number, because the mean of its divisors is an integer number (3446838144).

Almost surely, 2^131555724531 is an apocalyptic number.

131555724531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131555724531 is a deficient number, since it is larger than the sum of its proper divisors (89041916685).

131555724531 is a wasteful number, since it uses less digits than its factorization.

131555724531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6032.

The product of its digits is 315000, while the sum is 42.

It can be divided in two parts, 131555 and 724531, that added together give a triangular number (856086 = T₁₃₀₈).

The spelling of 131555724531 in words is "one hundred thirty-one billion, five hundred fifty-five million, seven hundred twenty-four thousand, five hundred thirty-one".