18281829091 has 4 divisors (see below), whose sum is σ = 18347828752. Its totient is φ = 18215829432.

The previous prime is 18281829073. The next prime is 18281829101. The reversal of 18281829091 is 19092818281.

It is a happy number.

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 18281829091 - 2⁷ = 18281828963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18281829191) 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, 32999415 + ... + 32999968.

It is an arithmetic number, because the mean of its divisors is an integer number (4586957188).

Almost surely, 2^18281829091 is an apocalyptic number.

18281829091 is a deficient number, since it is larger than the sum of its proper divisors (65999661).

18281829091 is an equidigital number, since it uses as much as digits as its factorization.

18281829091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65999660.

The product of its (nonzero) digits is 165888, while the sum is 49.

The spelling of 18281829091 in words is "eighteen billion, two hundred eighty-one million, eight hundred twenty-nine thousand, ninety-one".