131531540444522 has 4 divisors (see below), whose sum is σ = 197297310666786. Its totient is φ = 65765770222260.

The previous prime is 131531540444497. The next prime is 131531540444527. The reversal of 131531540444522 is 225444045135131.

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

It can be written as a sum of positive squares in only one way, i.e., 126534174085081 + 4997366359441 = 11248741^2 + 2235479^2 .

It is a super-2 number, since 2×131531540444522² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131531540444527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32882885111129 + ... + 32882885111132.

Almost surely, 2^{131531540444522} is an apocalyptic number.

131531540444522 is a deficient number, since it is larger than the sum of its proper divisors (65765770222264).

131531540444522 is an equidigital number, since it uses as much as digits as its factorization.

131531540444522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65765770222263.

The product of its (nonzero) digits is 1152000, while the sum is 44.

Adding to 131531540444522 its reverse (225444045135131), we get a palindrome (356975585579653).

The spelling of 131531540444522 in words is "one hundred thirty-one trillion, five hundred thirty-one billion, five hundred forty million, four hundred forty-four thousand, five hundred twenty-two".