2491656858 has 24 divisors (see below), whose sum is σ = 5584749300. Its totient is φ = 801912384.

The previous prime is 2491656857. The next prime is 2491656863. The reversal of 2491656858 is 8586561942.

2491656858 is a `hidden beast` number, since 24 + 9 + 1 + 6 + 568 + 58 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2432166489 + 59490369 = 49317^2 + 7713^2 .

It is not an unprimeable number, because it can be changed into a prime (2491656851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2386123 + ... + 2387166.

Almost surely, 2^2491656858 is an apocalyptic number.

2491656858 is an abundant number, since it is smaller than the sum of its proper divisors (3093092442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2491656858 is a wasteful number, since it uses less digits than its factorization.

2491656858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773326 (or 4773323 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The square root of 2491656858 is about 49916.4988555888. The cubic root of 2491656858 is about 1355.6973408886.

The spelling of 2491656858 in words is "two billion, four hundred ninety-one million, six hundred fifty-six thousand, eight hundred fifty-eight".