2491553 has 2 divisors, whose sum is σ = 2491554. Its totient is φ = 2491552.

The previous prime is 2491547. The next prime is 2491589. The reversal of 2491553 is 3551942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2486929 + 4624 = 1577^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 2491553 - 2¹⁰ = 2490529 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2491523) 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, 1245776 + 1245777.

It is an arithmetic number, because the mean of its divisors is an integer number (1245777).

2^2491553 is an apocalyptic number.

It is an amenable number.

2491553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491553 is an equidigital number, since it uses as much as digits as its factorization.

2491553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 29.

The square root of 2491553 is about 1578.4653939824. The cubic root of 2491553 is about 135.5678504430.

The spelling of 2491553 in words is "two million, four hundred ninety-one thousand, five hundred fifty-three".