399137655191 has 4 divisors (see below), whose sum is σ = 435422896584. Its totient is φ = 362852413800.

The previous prime is 399137655187. The next prime is 399137655211. The reversal of 399137655191 is 191556731993.

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 399137655191 - 2² = 399137655187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399137655191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399137655121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18142620680 + ... + 18142620701.

It is an arithmetic number, because the mean of its divisors is an integer number (108855724146).

Almost surely, 2^399137655191 is an apocalyptic number.

399137655191 is a deficient number, since it is larger than the sum of its proper divisors (36285241393).

399137655191 is a wasteful number, since it uses less digits than its factorization.

399137655191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36285241392.

The product of its digits is 6889050, while the sum is 59.

The spelling of 399137655191 in words is "three hundred ninety-nine billion, one hundred thirty-seven million, six hundred fifty-five thousand, one hundred ninety-one".