2639316891 has 16 divisors (see below), whose sum is σ = 3572584704. Its totient is φ = 1732988064.

The previous prime is 2639316839. The next prime is 2639316943. The reversal of 2639316891 is 1986139362.

It is an interprime number because it is at equal distance from previous prime (2639316839) and next prime (2639316943).

It is not a de Polignac number, because 2639316891 - 2⁷ = 2639316763 is a prime.

It is a super-2 number, since 2×2639316891² = 13931987302235811762, 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 2639316891.

It is not an unprimeable number, because it can be changed into a prime (2639316811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31770 + ... + 79296.

It is an arithmetic number, because the mean of its divisors is an integer number (223286544).

Almost surely, 2^2639316891 is an apocalyptic number.

2639316891 is a deficient number, since it is larger than the sum of its proper divisors (933267813).

2639316891 is a wasteful number, since it uses less digits than its factorization.

2639316891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47810.

The product of its digits is 419904, while the sum is 48.

The square root of 2639316891 is about 51374.2823891488. The cubic root of 2639316891 is about 1381.9654293478.

The spelling of 2639316891 in words is "two billion, six hundred thirty-nine million, three hundred sixteen thousand, eight hundred ninety-one".