391137665849 has 8 divisors (see below), whose sum is σ = 450970356480. Its totient is φ = 332293945536.

The previous prime is 391137665837. The next prime is 391137665869. The reversal of 391137665849 is 948566731193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 391137665849 - 2⁸ = 391137665593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391137665791 and 391137665800.

It is not an unprimeable number, because it can be changed into a prime (391137665869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247241729 + ... + 247243310.

It is an arithmetic number, because the mean of its divisors is an integer number (56371294560).

Almost surely, 2^391137665849 is an apocalyptic number.

It is an amenable number.

391137665849 is a deficient number, since it is larger than the sum of its proper divisors (59832690631).

391137665849 is a wasteful number, since it uses less digits than its factorization.

391137665849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494485159.

The product of its digits is 29393280, while the sum is 62.

The spelling of 391137665849 in words is "three hundred ninety-one billion, one hundred thirty-seven million, six hundred sixty-five thousand, eight hundred forty-nine".