131581523 has 2 divisors, whose sum is σ = 131581524. Its totient is φ = 131581522.

The previous prime is 131581511. The next prime is 131581553. The reversal of 131581523 is 325185131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131581523 - 2⁴ = 131581507 is a prime.

It is not a weakly prime, because it can be changed into another prime (131581553) 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 as a sum of consecutive naturals, namely, 65790761 + 65790762.

It is an arithmetic number, because the mean of its divisors is an integer number (65790762).

Almost surely, 2^131581523 is an apocalyptic number.

131581523 is a deficient number, since it is larger than the sum of its proper divisors (1).

131581523 is an equidigital number, since it uses as much as digits as its factorization.

131581523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 131581523 is about 11470.8989621564. The cubic root of 131581523 is about 508.6257028010.

The spelling of 131581523 in words is "one hundred thirty-one million, five hundred eighty-one thousand, five hundred twenty-three".