10081999 has 4 divisors (see below), whose sum is σ = 10118160. Its totient is φ = 10045840.

The previous prime is 10081997. The next prime is 10082021. The reversal of 10081999 is 99918001.

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 10081999 - 2¹ = 10081997 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 (10081991) 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, 17659 + ... + 18220.

It is an arithmetic number, because the mean of its divisors is an integer number (2529540).

Almost surely, 2^10081999 is an apocalyptic number.

10081999 is a deficient number, since it is larger than the sum of its proper divisors (36161).

10081999 is an equidigital number, since it uses as much as digits as its factorization.

10081999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36160.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 10081999 is about 3175.2163705801. The cubic root of 10081999 is about 216.0307383667.

The spelling of 10081999 in words is "ten million, eighty-one thousand, nine hundred ninety-nine".