1555242553 has 2 divisors, whose sum is σ = 1555242554. Its totient is φ = 1555242552.

The previous prime is 1555242529. The next prime is 1555242583. The reversal of 1555242553 is 3552425551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 864183609 + 691058944 = 29397^2 + 26288^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555242553 - 2⁹ = 1555242041 is a prime.

It is not a weakly prime, because it can be changed into another prime (1555242583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777621276 + 777621277.

It is an arithmetic number, because the mean of its divisors is an integer number (777621277).

Almost surely, 2^1555242553 is an apocalyptic number.

It is an amenable number.

1555242553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555242553 is an equidigital number, since it uses as much as digits as its factorization.

1555242553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150000, while the sum is 37.

The square root of 1555242553 is about 39436.5636560794. The cubic root of 1555242553 is about 1158.5978284236.

The spelling of 1555242553 in words is "one billion, five hundred fifty-five million, two hundred forty-two thousand, five hundred fifty-three".