391042171 has 12 divisors (see below), whose sum is σ = 424871832. Its totient is φ = 359738496.

The previous prime is 391042163. The next prime is 391042181. The reversal of 391042171 is 171240193.

It is not a de Polignac number, because 391042171 - 2³ = 391042163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391042111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48115 + ... + 55651.

It is an arithmetic number, because the mean of its divisors is an integer number (35405986).

Almost surely, 2^391042171 is an apocalyptic number.

391042171 is a deficient number, since it is larger than the sum of its proper divisors (33829661).

391042171 is a wasteful number, since it uses less digits than its factorization.

391042171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7870 (or 7857 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 391042171 is about 19774.7862441039. The cubic root of 391042171 is about 731.2645692570.

The spelling of 391042171 in words is "three hundred ninety-one million, forty-two thousand, one hundred seventy-one".