2591121563 has 8 divisors (see below), whose sum is σ = 2668274928. Its totient is φ = 2514736224.

The previous prime is 2591121539. The next prime is 2591121613. The reversal of 2591121563 is 3651211952.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2591121563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2591121163) 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, 185156 + ... + 198657.

It is an arithmetic number, because the mean of its divisors is an integer number (333534366).

Almost surely, 2^2591121563 is an apocalyptic number.

2591121563 is a deficient number, since it is larger than the sum of its proper divisors (77153365).

2591121563 is a wasteful number, since it uses less digits than its factorization.

2591121563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384013.

The product of its digits is 16200, while the sum is 35.

The square root of 2591121563 is about 50903.0604482677. The cubic root of 2591121563 is about 1373.5018946192.

It can be divided in two parts, 25911 and 21563, that added together give a palindrome (47474).

The spelling of 2591121563 in words is "two billion, five hundred ninety-one million, one hundred twenty-one thousand, five hundred sixty-three".