391124085 has 48 divisors (see below), whose sum is σ = 713821248. Its totient is φ = 181350400.

The previous prime is 391124081. The next prime is 391124113. The reversal of 391124085 is 580421193.

It is not a de Polignac number, because 391124085 - 2² = 391124081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391124081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 85045 + ... + 89525.

It is an arithmetic number, because the mean of its divisors is an integer number (14871276).

Almost surely, 2^391124085 is an apocalyptic number.

It is an amenable number.

391124085 is a deficient number, since it is larger than the sum of its proper divisors (322697163).

391124085 is a wasteful number, since it uses less digits than its factorization.

391124085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546 (or 4523 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 391124085 is about 19776.8573084805. The cubic root of 391124085 is about 731.3156265157.

The spelling of 391124085 in words is "three hundred ninety-one million, one hundred twenty-four thousand, eighty-five".