81992003 has 4 divisors (see below), whose sum is σ = 86815080. Its totient is φ = 77168928.

The previous prime is 81991999. The next prime is 81992023. The reversal of 81992003 is 30029918.

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 81992003 - 2² = 81991999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81992023) 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, 2411513 + ... + 2411546.

It is an arithmetic number, because the mean of its divisors is an integer number (21703770).

Almost surely, 2^81992003 is an apocalyptic number.

81992003 is a deficient number, since it is larger than the sum of its proper divisors (4823077).

81992003 is a wasteful number, since it uses less digits than its factorization.

81992003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4823076.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 81992003 is about 9054.9435669142. The cubic root of 81992003 is about 434.4340250208.

The spelling of 81992003 in words is "eighty-one million, nine hundred ninety-two thousand, three".