2591999999 has 4 divisors (see below), whose sum is σ = 2595566064. Its totient is φ = 2588433936.

The previous prime is 2591999987. The next prime is 2592000031. The reversal of 2591999999 is 9999991952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2591999999 - 2²⁰ = 2590951423 is a prime.

It is a Duffinian number.

2591999999 is a modest number, since divided by 99999 gives 25919 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591999909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1781942 + ... + 1783395.

It is an arithmetic number, because the mean of its divisors is an integer number (648891516).

Almost surely, 2^2591999999 is an apocalyptic number.

2591999999 is a deficient number, since it is larger than the sum of its proper divisors (3566065).

2591999999 is an equidigital number, since it uses as much as digits as its factorization.

2591999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3566064.

The product of its digits is 47829690, while the sum is 71.

The square root of 2591999999 is about 50911.6882356105. The cubic root of 2591999999 is about 1373.6570908873.

The spelling of 2591999999 in words is "two billion, five hundred ninety-one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".