391311407 has 2 divisors, whose sum is σ = 391311408. Its totient is φ = 391311406.

The previous prime is 391311391. The next prime is 391311433. The reversal of 391311407 is 704113193.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391311407 - 2⁴ = 391311391 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 391311407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391311467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195655703 + 195655704.

It is an arithmetic number, because the mean of its divisors is an integer number (195655704).

Almost surely, 2^391311407 is an apocalyptic number.

391311407 is a deficient number, since it is larger than the sum of its proper divisors (1).

391311407 is an equidigital number, since it uses as much as digits as its factorization.

391311407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 391311407 is about 19781.5926305240. The cubic root of 391311407 is about 731.4323581336.

The spelling of 391311407 in words is "three hundred ninety-one million, three hundred eleven thousand, four hundred seven".