2620561591 has 2 divisors, whose sum is σ = 2620561592. Its totient is φ = 2620561590.

The previous prime is 2620561487. The next prime is 2620561609. The reversal of 2620561591 is 1951650262.

2620561591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2620561591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2620561591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2620567591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310280795 + 1310280796.

It is an arithmetic number, because the mean of its divisors is an integer number (1310280796).

Almost surely, 2^2620561591 is an apocalyptic number.

2620561591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2620561591 is an equidigital number, since it uses as much as digits as its factorization.

2620561591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 2620561591 is about 51191.4210683782. The cubic root of 2620561591 is about 1378.6841744197.

The spelling of 2620561591 in words is "two billion, six hundred twenty million, five hundred sixty-one thousand, five hundred ninety-one".