2491538856 has 64 divisors (see below), whose sum is σ = 6733934400. Its totient is φ = 765531648.

The previous prime is 2491538827. The next prime is 2491538947. The reversal of 2491538856 is 6588351942.

It is a junction number, because it is equal to n+sod(n) for n = 2491538799 and 2491538808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56965 + ... + 90708.

It is an arithmetic number, because the mean of its divisors is an integer number (105217725).

Almost surely, 2^2491538856 is an apocalyptic number.

It is an amenable number.

2491538856 is an abundant number, since it is smaller than the sum of its proper divisors (4242395544).

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

2491538856 is a wasteful number, since it uses less digits than its factorization.

2491538856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147738 (or 147734 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 51.

The square root of 2491538856 is about 49915.3168476371. The cubic root of 2491538856 is about 1355.6759391291.

The spelling of 2491538856 in words is "two billion, four hundred ninety-one million, five hundred thirty-eight thousand, eight hundred fifty-six".