1811513864 has 8 divisors (see below), whose sum is σ = 3396588510. Its totient is φ = 905756928.

The previous prime is 1811513849. The next prime is 1811513909. The reversal of 1811513864 is 4683151181.

It can be written as a sum of positive squares in only one way, i.e., 1334440900 + 477072964 = 36530^2 + 21842^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113219609 + ... + 113219624.

Almost surely, 2^1811513864 is an apocalyptic number.

It is an amenable number.

1811513864 is a deficient number, since it is larger than the sum of its proper divisors (1585074646).

1811513864 is a wasteful number, since it uses less digits than its factorization.

1811513864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226439239 (or 226439235 counting only the distinct ones).

The product of its digits is 23040, while the sum is 38.

The square root of 1811513864 is about 42561.8827591074. The cubic root of 1811513864 is about 1219.0285790392.

The spelling of 1811513864 in words is "one billion, eight hundred eleven million, five hundred thirteen thousand, eight hundred sixty-four".