2491125613 has 4 divisors (see below), whose sum is σ = 2509047520. Its totient is φ = 2473203708.

The previous prime is 2491125599. The next prime is 2491125647. The reversal of 2491125613 is 3165211942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3165211942 = 2 ⋅1582605971.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2491125613 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 (2491125113) 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 in 3 ways as a sum of consecutive naturals, for example, 8960745 + ... + 8961022.

It is an arithmetic number, because the mean of its divisors is an integer number (627261880).

Almost surely, 2^2491125613 is an apocalyptic number.

It is an amenable number.

2491125613 is a deficient number, since it is larger than the sum of its proper divisors (17921907).

2491125613 is a wasteful number, since it uses less digits than its factorization.

2491125613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17921906.

The product of its digits is 12960, while the sum is 34.

The square root of 2491125613 is about 49911.1772351645. The cubic root of 2491125613 is about 1355.6009848404.

The spelling of 2491125613 in words is "two billion, four hundred ninety-one million, one hundred twenty-five thousand, six hundred thirteen".