131861113278 has 32 divisors (see below), whose sum is σ = 265260471840. Its totient is φ = 43697479680.

The previous prime is 131861113273. The next prime is 131861113283. The reversal of 131861113278 is 872311168131.

It is an interprime number because it is at equal distance from previous prime (131861113273) and next prime (131861113283).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131861113273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3911278 + ... + 3944846.

It is an arithmetic number, because the mean of its divisors is an integer number (8289389745).

Almost surely, 2^131861113278 is an apocalyptic number.

131861113278 is an abundant number, since it is smaller than the sum of its proper divisors (133399358562).

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

131861113278 is a wasteful number, since it uses less digits than its factorization.

131861113278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37372.

The product of its digits is 48384, while the sum is 42.

The spelling of 131861113278 in words is "one hundred thirty-one billion, eight hundred sixty-one million, one hundred thirteen thousand, two hundred seventy-eight".