18513625 has 16 divisors (see below), whose sum is σ = 24884496. Its totient is φ = 13670400.

The previous prime is 18513623. The next prime is 18513631. The reversal of 18513625 is 52631581.

It can be written as a sum of positive squares in 8 ways, for example, as 7203856 + 11309769 = 2684^2 + 3363^2 .

It is not a de Polignac number, because 18513625 - 2¹ = 18513623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18513623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4072 + ... + 7321.

It is an arithmetic number, because the mean of its divisors is an integer number (1555281).

Almost surely, 2^18513625 is an apocalyptic number.

It is an amenable number.

18513625 is a deficient number, since it is larger than the sum of its proper divisors (6370871).

18513625 is a wasteful number, since it uses less digits than its factorization.

18513625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11421 (or 11411 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 18513625 is about 4302.7462160811. The cubic root of 18513625 is about 264.5435360124.

It can be divided in two parts, 1851 and 3625, that added together give a square (5476 = 74²).

The spelling of 18513625 in words is "eighteen million, five hundred thirteen thousand, six hundred twenty-five".