391171157816 has 32 divisors (see below), whose sum is σ = 750883230000. Its totient is φ = 190980128256.

The previous prime is 391171157813. The next prime is 391171157833. The reversal of 391171157816 is 618751171193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391171157813) 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, 2710721 + ... + 2851376.

Almost surely, 2^391171157816 is an apocalyptic number.

It is an amenable number.

391171157816 is a deficient number, since it is larger than the sum of its proper divisors (359712072184).

391171157816 is a wasteful number, since it uses less digits than its factorization.

391171157816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5562311 (or 5562307 counting only the distinct ones).

The product of its digits is 317520, while the sum is 50.

The spelling of 391171157816 in words is "three hundred ninety-one billion, one hundred seventy-one million, one hundred fifty-seven thousand, eight hundred sixteen".