18525481 has 8 divisors (see below), whose sum is σ = 20437704. Its totient is φ = 16682880.

The previous prime is 18525449. The next prime is 18525497. The reversal of 18525481 is 18452581.

It can be written as a sum of positive squares in 4 ways, for example, as 885481 + 17640000 = 941^2 + 4200^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18525481 - 2⁵ = 18525449 is a prime.

It is a super-2 number, since 2×18525481² = 686386892562722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18525401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16846 + ... + 17911.

It is an arithmetic number, because the mean of its divisors is an integer number (2554713).

Almost surely, 2^18525481 is an apocalyptic number.

It is an amenable number.

18525481 is a deficient number, since it is larger than the sum of its proper divisors (1912223).

18525481 is a wasteful number, since it uses less digits than its factorization.

18525481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34811.

The product of its digits is 12800, while the sum is 34.

The square root of 18525481 is about 4304.1237203408. The cubic root of 18525481 is about 264.5999945915.

Subtracting from 18525481 its reverse (18452581), we obtain a square (72900 = 270²).

It can be divided in two parts, 185 and 25481, that multiplied together give a triangular number (4713985 = T₃₀₇₀).

The spelling of 18525481 in words is "eighteen million, five hundred twenty-five thousand, four hundred eighty-one".