2591260865 has 4 divisors (see below), whose sum is σ = 3109513044. Its totient is φ = 2073008688.

The previous prime is 2591260811. The next prime is 2591260927. The reversal of 2591260865 is 5680621952.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1184185744 + 1407075121 = 34412^2 + 37511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2591260865 - 2¹⁶ = 2591195329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259126082 + ... + 259126091.

It is an arithmetic number, because the mean of its divisors is an integer number (777378261).

Almost surely, 2^2591260865 is an apocalyptic number.

It is an amenable number.

2591260865 is a deficient number, since it is larger than the sum of its proper divisors (518252179).

2591260865 is an equidigital number, since it uses as much as digits as its factorization.

2591260865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518252178.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 2591260865 is about 50904.4287366040. The cubic root of 2591260865 is about 1373.5265079160.

The spelling of 2591260865 in words is "two billion, five hundred ninety-one million, two hundred sixty thousand, eight hundred sixty-five".