131111891620 has 12 divisors (see below), whose sum is σ = 275334972444. Its totient is φ = 52444756640.

The previous prime is 131111891611. The next prime is 131111891627. The reversal of 131111891620 is 26198111131.

It can be written as a sum of positive squares in 2 ways, for example, as 97658750016 + 33453141604 = 312504^2 + 182902^2 .

It is not an unprimeable number, because it can be changed into a prime (131111891627) 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 3 ways as a sum of consecutive naturals, for example, 3277797271 + ... + 3277797310.

It is an arithmetic number, because the mean of its divisors is an integer number (22944581037).

Almost surely, 2^131111891620 is an apocalyptic number.

131111891620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131111891620 is an abundant number, since it is smaller than the sum of its proper divisors (144223080824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131111891620 is a wasteful number, since it uses less digits than its factorization.

131111891620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6555594590 (or 6555594588 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 34.

The spelling of 131111891620 in words is "one hundred thirty-one billion, one hundred eleven million, eight hundred ninety-one thousand, six hundred twenty".