2561352517 has 2 divisors, whose sum is σ = 2561352518. Its totient is φ = 2561352516.

The previous prime is 2561352511. The next prime is 2561352553. The reversal of 2561352517 is 7152531652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2553685156 + 7667361 = 50534^2 + 2769^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561352517 - 2³ = 2561352509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561352511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280676258 + 1280676259.

It is an arithmetic number, because the mean of its divisors is an integer number (1280676259).

Almost surely, 2^2561352517 is an apocalyptic number.

It is an amenable number.

2561352517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561352517 is an equidigital number, since it uses as much as digits as its factorization.

2561352517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 37.

The square root of 2561352517 is about 50609.8065299602. The cubic root of 2561352517 is about 1368.2216286286.

The spelling of 2561352517 in words is "two billion, five hundred sixty-one million, three hundred fifty-two thousand, five hundred seventeen".