391447755109 has 16 divisors (see below), whose sum is σ = 415063914496. Its totient is φ = 368521747200.

The previous prime is 391447754987. The next prime is 391447755187. The reversal of 391447755109 is 901557744193.

It is a cyclic number.

It is not a de Polignac number, because 391447755109 - 2⁹ = 391447754597 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 391447755109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391447755509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7994269 + ... + 8043085.

It is an arithmetic number, because the mean of its divisors is an integer number (25941494656).

Almost surely, 2^391447755109 is an apocalyptic number.

It is an amenable number.

391447755109 is a deficient number, since it is larger than the sum of its proper divisors (23616159387).

391447755109 is a wasteful number, since it uses less digits than its factorization.

391447755109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55876.

The product of its (nonzero) digits is 4762800, while the sum is 55.

The spelling of 391447755109 in words is "three hundred ninety-one billion, four hundred forty-seven million, seven hundred fifty-five thousand, one hundred nine".