2491556 has 6 divisors (see below), whose sum is σ = 4360230. Its totient is φ = 1245776.

The previous prime is 2491553. The next prime is 2491589. The reversal of 2491556 is 6551942.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 614656 = 1370^2 + 784^2 .

It is a super-2 number, since 2×2491556² = 12415702602272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2491553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311441 + ... + 311448.

It is an arithmetic number, because the mean of its divisors is an integer number (726705).

2^2491556 is an apocalyptic number.

It is an amenable number.

2491556 is a deficient number, since it is larger than the sum of its proper divisors (1868674).

2491556 is a wasteful number, since it uses less digits than its factorization.

2491556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622893 (or 622891 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

The square root of 2491556 is about 1578.4663442722. The cubic root of 2491556 is about 135.5679048540.

The spelling of 2491556 in words is "two million, four hundred ninety-one thousand, five hundred fifty-six".