1800553 has 2 divisors, whose sum is σ = 1800554. Its totient is φ = 1800552.

The previous prime is 1800551. The next prime is 1800563. The reversal of 1800553 is 3550081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1557504 + 243049 = 1248^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800553 - 2¹ = 1800551 is a prime.

It is a super-2 number, since 2×1800553² = 6483982211618, which contains 22 as substring.

Together with 1800551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1800551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900276 + 900277.

It is an arithmetic number, because the mean of its divisors is an integer number (900277).

2^1800553 is an apocalyptic number.

It is an amenable number.

1800553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800553 is an equidigital number, since it uses as much as digits as its factorization.

1800553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 1800553 is about 1341.8468616053. The cubic root of 1800553 is about 121.6564958867.

The spelling of 1800553 in words is "one million, eight hundred thousand, five hundred fifty-three".