131382443778 has 32 divisors (see below), whose sum is σ = 277378257600. Its totient is φ = 41371646976.

The previous prime is 131382443729. The next prime is 131382443839. The reversal of 131382443778 is 877344283131.

It is a happy number.

It is a super-2 number, since 2×131382443778² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131382443778.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1592163 + ... + 1672646.

It is an arithmetic number, because the mean of its divisors is an integer number (8668070550).

Almost surely, 2^131382443778 is an apocalyptic number.

131382443778 is an abundant number, since it is smaller than the sum of its proper divisors (145995813822).

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

131382443778 is a wasteful number, since it uses less digits than its factorization.

131382443778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265186.

The product of its digits is 2709504, while the sum is 51.

The spelling of 131382443778 in words is "one hundred thirty-one billion, three hundred eighty-two million, four hundred forty-three thousand, seven hundred seventy-eight".