2491203856 has 20 divisors (see below), whose sum is σ = 4851722332. Its totient is φ = 1239146496.

The previous prime is 2491203823. The next prime is 2491203857. The reversal of 2491203856 is 6583021942.

It can be written as a sum of positive squares in 2 ways, for example, as 1442480400 + 1048723456 = 37980^2 + 32384^2 .

It is not an unprimeable number, because it can be changed into a prime (2491203857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400281 + ... + 406456.

Almost surely, 2^2491203856 is an apocalyptic number.

It is an amenable number.

2491203856 is a deficient number, since it is larger than the sum of its proper divisors (2360518476).

2491203856 is a wasteful number, since it uses less digits than its factorization.

2491203856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806938 (or 806932 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 2491203856 is about 49911.9610514354. The cubic root of 2491203856 is about 1355.6151772436.

The spelling of 2491203856 in words is "two billion, four hundred ninety-one million, two hundred three thousand, eight hundred fifty-six".