1854518881 has 4 divisors (see below), whose sum is σ = 1854627012. Its totient is φ = 1854410752.

The previous prime is 1854518863. The next prime is 1854518891. The reversal of 1854518881 is 1888154581.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 462035025 + 1392483856 = 21495^2 + 37316^2 .

It is a cyclic number.

It is not a de Polignac number, because 1854518881 - 2⁵ = 1854518849 is a prime.

It is a super-2 number, since 2×1854518881² = 6878480559970984322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1854518821) 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, 22000 + ... + 64753.

It is an arithmetic number, because the mean of its divisors is an integer number (463656753).

Almost surely, 2^1854518881 is an apocalyptic number.

It is an amenable number.

1854518881 is a deficient number, since it is larger than the sum of its proper divisors (108131).

1854518881 is an equidigital number, since it uses as much as digits as its factorization.

1854518881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108130.

The product of its digits is 409600, while the sum is 49.

The square root of 1854518881 is about 43064.1252204198. The cubic root of 1854518881 is about 1228.5997419258.

The spelling of 1854518881 in words is "one billion, eight hundred fifty-four million, five hundred eighteen thousand, eight hundred eighty-one".