6391291690 has 32 divisors (see below), whose sum is σ = 13205752704. Its totient is φ = 2181641280.

The previous prime is 6391291679. The next prime is 6391291691. The reversal of 6391291690 is 961921936.

It is a super-2 number, since 2×6391291690² = 81697218933326112200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6391291690.

It is not an unprimeable number, because it can be changed into a prime (6391291691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185221 + ... + 217000.

It is an arithmetic number, because the mean of its divisors is an integer number (412679772).

Almost surely, 2^6391291690 is an apocalyptic number.

6391291690 is an abundant number, since it is smaller than the sum of its proper divisors (6814461014).

6391291690 is a wasteful number, since it uses less digits than its factorization.

6391291690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402462.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 6391291690 is about 79945.5545355713. The cubic root of 6391291690 is about 1855.7930596678.

The spelling of 6391291690 in words is "six billion, three hundred ninety-one million, two hundred ninety-one thousand, six hundred ninety".