2491656613 has 2 divisors, whose sum is σ = 2491656614. Its totient is φ = 2491656612.

The previous prime is 2491656611. The next prime is 2491656703. The reversal of 2491656613 is 3166561942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1663253089 + 828403524 = 40783^2 + 28782^2 .

It is a cyclic number.

It is not a de Polignac number, because 2491656613 - 2¹ = 2491656611 is a prime.

Together with 2491656611, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2491656613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2491656611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245828306 + 1245828307.

It is an arithmetic number, because the mean of its divisors is an integer number (1245828307).

Almost surely, 2^2491656613 is an apocalyptic number.

It is an amenable number.

2491656613 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491656613 is an equidigital number, since it uses as much as digits as its factorization.

2491656613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 2491656613 is about 49916.4964014904. The cubic root of 2491656613 is about 1355.6972964542.

The spelling of 2491656613 in words is "two billion, four hundred ninety-one million, six hundred fifty-six thousand, six hundred thirteen".