6407901891 has 6 divisors (see below), whose sum is σ = 9255858300. Its totient is φ = 4271934588.

The previous prime is 6407901889. The next prime is 6407901901. The reversal of 6407901891 is 1981097046.

It is a happy number.

It is not a de Polignac number, because 6407901891 - 2¹ = 6407901889 is a prime.

It is a super-2 number, since 2×6407901891² = 82122413289362751762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6407901881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 355994541 + ... + 355994558.

It is an arithmetic number, because the mean of its divisors is an integer number (1542643050).

Almost surely, 2^6407901891 is an apocalyptic number.

6407901891 is a deficient number, since it is larger than the sum of its proper divisors (2847956409).

6407901891 is a wasteful number, since it uses less digits than its factorization.

6407901891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711989105 (or 711989102 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 6407901891 is about 80049.3715840418. The cubic root of 6407901891 is about 1857.3993302070.

The spelling of 6407901891 in words is "six billion, four hundred seven million, nine hundred one thousand, eight hundred ninety-one".