391961542385 has 8 divisors (see below), whose sum is σ = 537547258176. Its totient is φ = 268773629040.

The previous prime is 391961542361. The next prime is 391961542403. The reversal of 391961542385 is 583245169193.

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

It is not a de Polignac number, because 391961542385 - 2¹² = 391961538289 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 391961542385.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5599450571 + ... + 5599450640.

It is an arithmetic number, because the mean of its divisors is an integer number (67193407272).

Almost surely, 2^391961542385 is an apocalyptic number.

391961542385 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

391961542385 is a deficient number, since it is larger than the sum of its proper divisors (145585715791).

391961542385 is a wasteful number, since it uses less digits than its factorization.

391961542385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11198901223.

The product of its digits is 6998400, while the sum is 56.

The spelling of 391961542385 in words is "three hundred ninety-one billion, nine hundred sixty-one million, five hundred forty-two thousand, three hundred eighty-five".