2798731491391 has 4 divisors (see below), whose sum is σ = 3053161626984. Its totient is φ = 2544301355800.

The previous prime is 2798731491373. The next prime is 2798731491397. The reversal of 2798731491391 is 1931941378972.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2798731491391 - 2⁵ = 2798731491359 is a prime.

It is a super-2 number, since 2×2798731491391² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2798731491397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127215067780 + ... + 127215067801.

It is an arithmetic number, because the mean of its divisors is an integer number (763290406746).

Almost surely, 2^{2798731491391} is an apocalyptic number.

2798731491391 is a deficient number, since it is larger than the sum of its proper divisors (254430135593).

2798731491391 is a wasteful number, since it uses less digits than its factorization.

2798731491391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254430135592.

The product of its digits is 20575296, while the sum is 64.

The spelling of 2798731491391 in words is "two trillion, seven hundred ninety-eight billion, seven hundred thirty-one million, four hundred ninety-one thousand, three hundred ninety-one".