2591126689 has 8 divisors (see below), whose sum is σ = 2745765000. Its totient is φ = 2436734976.

The previous prime is 2591126647. The next prime is 2591126693. The reversal of 2591126689 is 9866211952.

It can be written as a sum of positive squares in 4 ways, for example, as 877166689 + 1713960000 = 29617^2 + 41400^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2591126689 - 2⁷ = 2591126561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2591126639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39784 + ... + 82249.

It is an arithmetic number, because the mean of its divisors is an integer number (343220625).

Almost surely, 2^2591126689 is an apocalyptic number.

It is an amenable number.

2591126689 is a deficient number, since it is larger than the sum of its proper divisors (154638311).

2591126689 is a wasteful number, since it uses less digits than its factorization.

2591126689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123299.

The product of its digits is 466560, while the sum is 49.

The square root of 2591126689 is about 50903.1107988500. The cubic root of 2591126689 is about 1373.5028003488.

The spelling of 2591126689 in words is "two billion, five hundred ninety-one million, one hundred twenty-six thousand, six hundred eighty-nine".