131326878522436 has 9 divisors (see below), whose sum is σ = 229822077523549. Its totient is φ = 65663427801424.

The previous prime is 131326878522421. The next prime is 131326878522439. The reversal of 131326878522436 is 634225878623131.

It is a happy number.

The square root of 131326878522436 is 11459794.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3151512562500 + 128175365959936 = 1775250^2 + 11321456^2 .

It is a super-3 number, since 3×131326878522436³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131326878522439) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20054640 + ... + 25784536.

Almost surely, 2^{131326878522436} is an apocalyptic number.

131326878522436 is the 11459794-th square number.

It is an amenable number.

131326878522436 is a deficient number, since it is larger than the sum of its proper divisors (98495199001113).

131326878522436 is an frugal number, since it uses more digits than its factorization.

131326878522436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11459798 (or 5729899 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 61.

The spelling of 131326878522436 in words is "one hundred thirty-one trillion, three hundred twenty-six billion, eight hundred seventy-eight million, five hundred twenty-two thousand, four hundred thirty-six".