391055055 has 48 divisors (see below), whose sum is σ = 665280864. Its totient is φ = 196116480.

The previous prime is 391055033. The next prime is 391055083. The reversal of 391055055 is 550550193.

It is not a de Polignac number, because 391055055 - 2⁶ = 391054991 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1391515 + ... + 1391795.

It is an arithmetic number, because the mean of its divisors is an integer number (13860018).

Almost surely, 2^391055055 is an apocalyptic number.

391055055 is a deficient number, since it is larger than the sum of its proper divisors (274225809).

391055055 is a wasteful number, since it uses less digits than its factorization.

391055055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 565 counting only the distinct ones).

The product of its (nonzero) digits is 16875, while the sum is 33.

The square root of 391055055 is about 19775.1120097966. The cubic root of 391055055 is about 731.2726003680.

The spelling of 391055055 in words is "three hundred ninety-one million, fifty-five thousand, fifty-five".