2561910317 has 4 divisors (see below), whose sum is σ = 2562857340. Its totient is φ = 2560963296.

The previous prime is 2561910227. The next prime is 2561910347. The reversal of 2561910317 is 7130191652.

2561910317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2399628196 + 162282121 = 48986^2 + 12739^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561910317 - 2⁸ = 2561910061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561910347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469442 + ... + 474867.

It is an arithmetic number, because the mean of its divisors is an integer number (640714335).

Almost surely, 2^2561910317 is an apocalyptic number.

It is an amenable number.

2561910317 is a deficient number, since it is larger than the sum of its proper divisors (947023).

2561910317 is an equidigital number, since it uses as much as digits as its factorization.

2561910317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947022.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 2561910317 is about 50615.3170196533. The cubic root of 2561910317 is about 1368.3209431671.

The spelling of 2561910317 in words is "two billion, five hundred sixty-one million, nine hundred ten thousand, three hundred seventeen".