1814855881 has 2 divisors, whose sum is σ = 1814855882. Its totient is φ = 1814855880.

The previous prime is 1814855837. The next prime is 1814855899. The reversal of 1814855881 is 1885584181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1581255225 + 233600656 = 39765^2 + 15284^2 .

It is a cyclic number.

It is not a de Polignac number, because 1814855881 - 2⁹ = 1814855369 is a prime.

It is a super-2 number, since 2×1814855881² = 6587403737600572322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1814855831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907427940 + 907427941.

It is an arithmetic number, because the mean of its divisors is an integer number (907427941).

Almost surely, 2^1814855881 is an apocalyptic number.

It is an amenable number.

1814855881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1814855881 is an equidigital number, since it uses as much as digits as its factorization.

1814855881 is an evil number, because the sum of its binary digits is even.

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

The square root of 1814855881 is about 42601.1253489858. The cubic root of 1814855881 is about 1219.7777703705. Note that the first 5 decimals are identical.

The spelling of 1814855881 in words is "one billion, eight hundred fourteen million, eight hundred fifty-five thousand, eight hundred eighty-one".