2591322561 has 12 divisors (see below), whose sum is σ = 3743570688. Its totient is φ = 1727294904.

The previous prime is 2591322553. The next prime is 2591322589. The reversal of 2591322561 is 1652231952.

It is a happy number.

2591322561 is a `hidden beast` number, since 2 + 5 + 91 + 3 + 2 + 2 + 561 = 666.

It is not a de Polignac number, because 2591322561 - 2³ = 2591322553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2591322511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60036 + ... + 93738.

It is an arithmetic number, because the mean of its divisors is an integer number (311964224).

Almost surely, 2^2591322561 is an apocalyptic number.

It is an amenable number.

2591322561 is a deficient number, since it is larger than the sum of its proper divisors (1152248127).

2591322561 is a wasteful number, since it uses less digits than its factorization.

2591322561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42252 (or 42249 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 2591322561 is about 50905.0347313505. The cubic root of 2591322561 is about 1373.5374087121.

The spelling of 2591322561 in words is "two billion, five hundred ninety-one million, three hundred twenty-two thousand, five hundred sixty-one".