1918334881 has 4 divisors (see below), whose sum is σ = 1919999812. Its totient is φ = 1916669952.

The previous prime is 1918334879. The next prime is 1918334903. The reversal of 1918334881 is 1884338191.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 581774400 + 1336560481 = 24120^2 + 36559^2 .

It is a cyclic number.

It is not a de Polignac number, because 1918334881 - 2¹ = 1918334879 is a prime.

It is a super-2 number, since 2×1918334881² = 7360017431322568322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1918334851) 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, 830736 + ... + 833041.

It is an arithmetic number, because the mean of its divisors is an integer number (479999953).

Almost surely, 2^1918334881 is an apocalyptic number.

It is an amenable number.

1918334881 is a deficient number, since it is larger than the sum of its proper divisors (1664931).

1918334881 is a wasteful number, since it uses less digits than its factorization.

1918334881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664930.

The product of its digits is 165888, while the sum is 46.

The square root of 1918334881 is about 43798.7999949770. The cubic root of 1918334881 is about 1242.5335990277.

The spelling of 1918334881 in words is "one billion, nine hundred eighteen million, three hundred thirty-four thousand, eight hundred eighty-one".