23181012 has 24 divisors (see below), whose sum is σ = 60099200. Its totient is φ = 7726968.

The previous prime is 23181001. The next prime is 23181017. The reversal of 23181012 is 21018132.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23181017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107212 + ... + 107427.

Almost surely, 2^23181012 is an apocalyptic number.

It is an amenable number.

23181012 is an abundant number, since it is smaller than the sum of its proper divisors (36918188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23181012 is a wasteful number, since it uses less digits than its factorization.

23181012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214652 (or 214644 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 23181012 is about 4814.6663435798. Note that the first 3 decimals coincide. The cubic root of 23181012 is about 285.1307986875.

Adding to 23181012 its reverse (21018132), we get a palindrome (44199144).

The spelling of 23181012 in words is "twenty-three million, one hundred eighty-one thousand, twelve".