81083903099 has 4 divisors (see below), whose sum is σ = 81994958280. Its totient is φ = 80172847920.

The previous prime is 81083903083. The next prime is 81083903101. The reversal of 81083903099 is 99030938018.

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 81083903099 - 2⁴ = 81083903083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81083903899) 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, 455527457 + ... + 455527634.

It is an arithmetic number, because the mean of its divisors is an integer number (20498739570).

Almost surely, 2^81083903099 is an apocalyptic number.

81083903099 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

81083903099 is a deficient number, since it is larger than the sum of its proper divisors (911055181).

81083903099 is an equidigital number, since it uses as much as digits as its factorization.

81083903099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911055180.

The product of its (nonzero) digits is 419904, while the sum is 50.

The spelling of 81083903099 in words is "eighty-one billion, eighty-three million, nine hundred three thousand, ninety-nine".