391068971 has 2 divisors, whose sum is σ = 391068972. Its totient is φ = 391068970.

The previous prime is 391068967. The next prime is 391069009. The reversal of 391068971 is 179860193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391068971 - 2² = 391068967 is a prime.

It is not a weakly prime, because it can be changed into another prime (391068911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195534485 + 195534486.

It is an arithmetic number, because the mean of its divisors is an integer number (195534486).

Almost surely, 2^391068971 is an apocalyptic number.

391068971 is a deficient number, since it is larger than the sum of its proper divisors (1).

391068971 is an equidigital number, since it uses as much as digits as its factorization.

391068971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 391068971 is about 19775.4638630804. The cubic root of 391068971 is about 731.2812745676.

The spelling of 391068971 in words is "three hundred ninety-one million, sixty-eight thousand, nine hundred seventy-one".