131216809538 has 16 divisors (see below), whose sum is σ = 199650842496. Its totient is φ = 64667023680.

The previous prime is 131216809531. The next prime is 131216809543. The reversal of 131216809538 is 835908612131.

It is a super-2 number, since 2×131216809538² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131216809492 and 131216809501.

It is not an unprimeable number, because it can be changed into a prime (131216809531) 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 7 ways as a sum of consecutive naturals, for example, 416795 + ... + 660417.

It is an arithmetic number, because the mean of its divisors is an integer number (12478177656).

Almost surely, 2^131216809538 is an apocalyptic number.

131216809538 is a deficient number, since it is larger than the sum of its proper divisors (68434032958).

131216809538 is a wasteful number, since it uses less digits than its factorization.

131216809538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247489.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 131216809538 in words is "one hundred thirty-one billion, two hundred sixteen million, eight hundred nine thousand, five hundred thirty-eight".