6391901 has 2 divisors, whose sum is σ = 6391902. Its totient is φ = 6391900.

The previous prime is 6391897. The next prime is 6391927. The reversal of 6391901 is 1091936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6255001 + 136900 = 2501^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 6391901 - 2² = 6391897 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6391991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195950 + 3195951.

It is an arithmetic number, because the mean of its divisors is an integer number (3195951).

Almost surely, 2^6391901 is an apocalyptic number.

It is an amenable number.

6391901 is a deficient number, since it is larger than the sum of its proper divisors (1).

6391901 is an equidigital number, since it uses as much as digits as its factorization.

6391901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 6391901 is about 2528.2209159802. The cubic root of 6391901 is about 185.5852031437.

The spelling of 6391901 in words is "six million, three hundred ninety-one thousand, nine hundred one".