1802000091 has 4 divisors (see below), whose sum is σ = 2402666792. Its totient is φ = 1201333392.

The previous prime is 1802000089. The next prime is 1802000111. The reversal of 1802000091 is 1900002081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1900002081 = 3 ⋅633334027.

It is not a de Polignac number, because 1802000091 - 2¹ = 1802000089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1802000791) 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, 300333346 + ... + 300333351.

It is an arithmetic number, because the mean of its divisors is an integer number (600666698).

Almost surely, 2^1802000091 is an apocalyptic number.

1802000091 is a deficient number, since it is larger than the sum of its proper divisors (600666701).

1802000091 is an equidigital number, since it uses as much as digits as its factorization.

1802000091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600666700.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1802000091 is about 42449.9716254322. The cubic root of 1802000091 is about 1216.8907863186.

The spelling of 1802000091 in words is "one billion, eight hundred two million, ninety-one", and thus it is an aban number.