181225603 has 16 divisors (see below), whose sum is σ = 201307680. Its totient is φ = 162100224.

The previous prime is 181225601. The next prime is 181225621. The reversal of 181225603 is 306522181.

It is not a de Polignac number, because 181225603 - 2¹ = 181225601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181225601) 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, 55603 + ... + 58771.

It is an arithmetic number, because the mean of its divisors is an integer number (12581730).

Almost surely, 2^181225603 is an apocalyptic number.

181225603 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

181225603 is a deficient number, since it is larger than the sum of its proper divisors (20082077).

181225603 is a wasteful number, since it uses less digits than its factorization.

181225603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 181225603 is about 13462.0059055105. The cubic root of 181225603 is about 565.9002048664.

Adding to 181225603 its reverse (306522181), we get a palindrome (487747784).

The spelling of 181225603 in words is "one hundred eighty-one million, two hundred twenty-five thousand, six hundred three".