23081818 has 16 divisors (see below), whose sum is σ = 37353960. Its totient is φ = 10656256.

The previous prime is 23081791. The next prime is 23081819. The reversal of 23081818 is 81818032.

It can be written as a sum of positive squares in 4 ways, for example, as 21930489 + 1151329 = 4683^2 + 1073^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 23081818.

It is not an unprimeable number, because it can be changed into a prime (23081819) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4603 + ... + 8206.

Almost surely, 2^23081818 is an apocalyptic number.

23081818 is a deficient number, since it is larger than the sum of its proper divisors (14272142).

23081818 is a wasteful number, since it uses less digits than its factorization.

23081818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12881.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 23081818 is about 4804.3540668856. The cubic root of 23081818 is about 284.7235155918.

The spelling of 23081818 in words is "twenty-three million, eighty-one thousand, eight hundred eighteen".