1811838897 has 24 divisors (see below), whose sum is σ = 2901832128. Its totient is φ = 1080079200.

The previous prime is 1811838893. The next prime is 1811838901. The reversal of 1811838897 is 7988381181.

It is an interprime number because it is at equal distance from previous prime (1811838893) and next prime (1811838901).

It is not a de Polignac number, because 1811838897 - 2² = 1811838893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1811838893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143973 + ... + 156050.

It is an arithmetic number, because the mean of its divisors is an integer number (120909672).

Almost surely, 2^1811838897 is an apocalyptic number.

It is an amenable number.

1811838897 is a deficient number, since it is larger than the sum of its proper divisors (1089993231).

1811838897 is a wasteful number, since it uses less digits than its factorization.

1811838897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300101 (or 300098 counting only the distinct ones).

The product of its digits is 774144, while the sum is 54.

The square root of 1811838897 is about 42565.7009457145. The cubic root of 1811838897 is about 1219.1014832233.

The spelling of 1811838897 in words is "one billion, eight hundred eleven million, eight hundred thirty-eight thousand, eight hundred ninety-seven".