181225318 has 8 divisors (see below), whose sum is σ = 280607040. Its totient is φ = 87689640.

The previous prime is 181225309. The next prime is 181225351. The reversal of 181225318 is 813522181.

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

It is a super-2 number, since 2×181225318² = 65685231768402248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 181225318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1461433 + ... + 1461556.

It is an arithmetic number, because the mean of its divisors is an integer number (35075880).

Almost surely, 2^181225318 is an apocalyptic number.

181225318 is a deficient number, since it is larger than the sum of its proper divisors (99381722).

181225318 is a wasteful number, since it uses less digits than its factorization.

181225318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923022.

The product of its digits is 3840, while the sum is 31.

The square root of 181225318 is about 13461.9953201596. The cubic root of 181225318 is about 565.8999082165.

Adding to 181225318 its reverse (813522181), we get a palindrome (994747499).

The spelling of 181225318 in words is "one hundred eighty-one million, two hundred twenty-five thousand, three hundred eighteen".