23081999 has 4 divisors (see below), whose sum is σ = 23877960. Its totient is φ = 22286040.

The previous prime is 23081987. The next prime is 23082001. The reversal of 23081999 is 99918032.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23081999 - 2¹² = 23077903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23081909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397937 + ... + 397994.

It is an arithmetic number, because the mean of its divisors is an integer number (5969490).

Almost surely, 2^23081999 is an apocalyptic number.

23081999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

23081999 is a deficient number, since it is larger than the sum of its proper divisors (795961).

23081999 is an equidigital number, since it uses as much as digits as its factorization.

23081999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795960.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 23081999 is about 4804.3729039283. The cubic root of 23081999 is about 284.7242598258.

The spelling of 23081999 in words is "twenty-three million, eighty-one thousand, nine hundred ninety-nine".