6402918391 has 2 divisors, whose sum is σ = 6402918392. Its totient is φ = 6402918390.

The previous prime is 6402918377. The next prime is 6402918421. The reversal of 6402918391 is 1938192046.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6402918391 - 2⁵ = 6402918359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6402910391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3201459195 + 3201459196.

It is an arithmetic number, because the mean of its divisors is an integer number (3201459196).

Almost surely, 2^6402918391 is an apocalyptic number.

6402918391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6402918391 is an equidigital number, since it uses as much as digits as its factorization.

6402918391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 6402918391 is about 80018.2378648768. The cubic root of 6402918391 is about 1856.9176982913.

The spelling of 6402918391 in words is "six billion, four hundred two million, nine hundred eighteen thousand, three hundred ninety-one".