3131881838457 has 4 divisors (see below), whose sum is σ = 4175842451280. Its totient is φ = 2087921225636.

The previous prime is 3131881838443. The next prime is 3131881838479. The reversal of 3131881838457 is 7548381881313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3131881838457 - 2⁷ = 3131881838329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3131881838457.

It is not an unprimeable number, because it can be changed into a prime (3131881848457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521980306407 + ... + 521980306412.

It is an arithmetic number, because the mean of its divisors is an integer number (1043960612820).

Almost surely, 2^{3131881838457} is an apocalyptic number.

It is an amenable number.

3131881838457 is a deficient number, since it is larger than the sum of its proper divisors (1043960612823).

3131881838457 is a wasteful number, since it uses less digits than its factorization.

3131881838457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043960612822.

The product of its digits is 15482880, while the sum is 60.

The spelling of 3131881838457 in words is "three trillion, one hundred thirty-one billion, eight hundred eighty-one million, eight hundred thirty-eight thousand, four hundred fifty-seven".