2491564 has 24 divisors (see below), whose sum is σ = 4616640. Its totient is φ = 1174656.

The previous prime is 2491553. The next prime is 2491589. The reversal of 2491564 is 4651942.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5224 + ... + 5680.

It is an arithmetic number, because the mean of its divisors is an integer number (192360).

2^2491564 is an apocalyptic number.

It is an amenable number.

2491564 is a deficient number, since it is larger than the sum of its proper divisors (2125076).

2491564 is a wasteful number, since it uses less digits than its factorization.

2491564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 535 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 2491564 is about 1578.4688783755. The cubic root of 2491564 is about 135.5680499497.

The spelling of 2491564 in words is "two million, four hundred ninety-one thousand, five hundred sixty-four".