391981279759 has 16 divisors (see below), whose sum is σ = 406083339360. Its totient is φ = 378132543360.

The previous prime is 391981279757. The next prime is 391981279769. The reversal of 391981279759 is 957972189193.

It is a cyclic number.

It is not a de Polignac number, because 391981279759 - 2¹ = 391981279757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391981279757) 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, 8729337 + ... + 8774125.

It is an arithmetic number, because the mean of its divisors is an integer number (25380208710).

Almost surely, 2^391981279759 is an apocalyptic number.

391981279759 is a deficient number, since it is larger than the sum of its proper divisors (14102059601).

391981279759 is a wasteful number, since it uses less digits than its factorization.

391981279759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47610.

The product of its digits is 77157360, while the sum is 70.

The spelling of 391981279759 in words is "three hundred ninety-one billion, nine hundred eighty-one million, two hundred seventy-nine thousand, seven hundred fifty-nine".