2561713631 has 4 divisors (see below), whose sum is σ = 2571237000. Its totient is φ = 2552190264.

The previous prime is 2561713603. The next prime is 2561713633. The reversal of 2561713631 is 1363171652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561713631 is a prime.

It is a super-2 number, since 2×2561713631² = 13124753454502408322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2561713591 and 2561713600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561713633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4761281 + ... + 4761818.

It is an arithmetic number, because the mean of its divisors is an integer number (642809250).

Almost surely, 2^2561713631 is an apocalyptic number.

2561713631 is a deficient number, since it is larger than the sum of its proper divisors (9523369).

2561713631 is an equidigital number, since it uses as much as digits as its factorization.

2561713631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9523368.

The product of its digits is 22680, while the sum is 35.

The square root of 2561713631 is about 50613.3740329569. The cubic root of 2561713631 is about 1368.2859254879.

The spelling of 2561713631 in words is "two billion, five hundred sixty-one million, seven hundred thirteen thousand, six hundred thirty-one".