391797099139679 has 4 divisors (see below), whose sum is σ = 414843987324384. Its totient is φ = 368750210954976.

The previous prime is 391797099139627. The next prime is 391797099139681. The reversal of 391797099139679 is 976931990797193.

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 391797099139679 - 2¹² = 391797099135583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391797099139594 and 391797099139603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391797099139279) 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, 11523444092327 + ... + 11523444092360.

It is an arithmetic number, because the mean of its divisors is an integer number (103710996831096).

Almost surely, 2^{391797099139679} is an apocalyptic number.

391797099139679 is a deficient number, since it is larger than the sum of its proper divisors (23046888184705).

391797099139679 is a wasteful number, since it uses less digits than its factorization.

391797099139679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23046888184704.

The product of its (nonzero) digits is 9843350202, while the sum is 89.

The spelling of 391797099139679 in words is "three hundred ninety-one trillion, seven hundred ninety-seven billion, ninety-nine million, one hundred thirty-nine thousand, six hundred seventy-nine".