2491656842 has 8 divisors (see below), whose sum is σ = 3738159300. Its totient is φ = 1245603744.

The previous prime is 2491656841. The next prime is 2491656851. The reversal of 2491656842 is 2486561942.

It can be written as a sum of positive squares in 2 ways, for example, as 1662274441 + 829382401 = 40771^2 + 28799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2491656841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98117 + ... + 120872.

Almost surely, 2^2491656842 is an apocalyptic number.

2491656842 is a deficient number, since it is larger than the sum of its proper divisors (1246502458).

2491656842 is a wasteful number, since it uses less digits than its factorization.

2491656842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224680.

The product of its digits is 829440, while the sum is 47.

The square root of 2491656842 is about 49916.4986953212. The cubic root of 2491656842 is about 1355.6973379868.

The spelling of 2491656842 in words is "two billion, four hundred ninety-one million, six hundred fifty-six thousand, eight hundred forty-two".