391379171 has 2 divisors, whose sum is σ = 391379172. Its totient is φ = 391379170.

The previous prime is 391379161. The next prime is 391379179. The reversal of 391379171 is 171973193.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 391379171 - 2¹⁴ = 391362787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (391379179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195689585 + 195689586.

It is an arithmetic number, because the mean of its divisors is an integer number (195689586).

Almost surely, 2^391379171 is an apocalyptic number.

391379171 is a deficient number, since it is larger than the sum of its proper divisors (1).

391379171 is an equidigital number, since it uses as much as digits as its factorization.

391379171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35721, while the sum is 41.

The square root of 391379171 is about 19783.3053608339. The cubic root of 391379171 is about 731.4745767866.

The spelling of 391379171 in words is "three hundred ninety-one million, three hundred seventy-nine thousand, one hundred seventy-one".