1811864363 has 4 divisors (see below), whose sum is σ = 1812903240. Its totient is φ = 1810825488.

The previous prime is 1811864321. The next prime is 1811864387. The reversal of 1811864363 is 3634681181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3634681181 = 107 ⋅33968983.

It is a cyclic number.

It is not a de Polignac number, because 1811864363 - 2²⁶ = 1744755499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1811864363.

It is not an unprimeable number, because it can be changed into a prime (1811864393) 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, 516818 + ... + 520311.

It is an arithmetic number, because the mean of its divisors is an integer number (453225810).

Almost surely, 2^1811864363 is an apocalyptic number.

1811864363 is a deficient number, since it is larger than the sum of its proper divisors (1038877).

1811864363 is a wasteful number, since it uses less digits than its factorization.

1811864363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038876.

The product of its digits is 82944, while the sum is 41.

The square root of 1811864363 is about 42566.0000822253. Note that the first 4 decimals coincide. The cubic root of 1811864363 is about 1219.1071948226.

The spelling of 1811864363 in words is "one billion, eight hundred eleven million, eight hundred sixty-four thousand, three hundred sixty-three".