2491125647 has 2 divisors, whose sum is σ = 2491125648. Its totient is φ = 2491125646.

The previous prime is 2491125599. The next prime is 2491125649. The reversal of 2491125647 is 7465211942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2491125647 - 2²⁸ = 2222690191 is a prime.

Together with 2491125649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2491125649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245562823 + 1245562824.

It is an arithmetic number, because the mean of its divisors is an integer number (1245562824).

Almost surely, 2^2491125647 is an apocalyptic number.

2491125647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491125647 is an equidigital number, since it uses as much as digits as its factorization.

2491125647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 2491125647 is about 49911.1775757695. The cubic root of 2491125647 is about 1355.6009910077.

The spelling of 2491125647 in words is "two billion, four hundred ninety-one million, one hundred twenty-five thousand, six hundred forty-seven".