18553225 has 12 divisors (see below), whose sum is σ = 23178204. Its totient is φ = 14731520.

The previous prime is 18553201. The next prime is 18553231. The reversal of 18553225 is 52235581.

It can be written as a sum of positive squares in 6 ways, for example, as 2134521 + 16418704 = 1461^2 + 4052^2 .

It is not a de Polignac number, because 18553225 - 2²¹ = 16456073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 717 + ... + 6133.

It is an arithmetic number, because the mean of its divisors is an integer number (1931517).

Almost surely, 2^18553225 is an apocalyptic number.

It is an amenable number.

18553225 is a deficient number, since it is larger than the sum of its proper divisors (4624979).

18553225 is a wasteful number, since it uses less digits than its factorization.

18553225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564 (or 5559 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 18553225 is about 4307.3454702403. The cubic root of 18553225 is about 264.7320181650.

The spelling of 18553225 in words is "eighteen million, five hundred fifty-three thousand, two hundred twenty-five".