1814278021 has 2 divisors, whose sum is σ = 1814278022. Its totient is φ = 1814278020.

The previous prime is 1814277989. The next prime is 1814278051. The reversal of 1814278021 is 1208724181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1287804996 + 526473025 = 35886^2 + 22945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1814278021 - 2⁵ = 1814277989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1814278051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907139010 + 907139011.

It is an arithmetic number, because the mean of its divisors is an integer number (907139011).

Almost surely, 2^1814278021 is an apocalyptic number.

It is an amenable number.

1814278021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1814278021 is an equidigital number, since it uses as much as digits as its factorization.

1814278021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 1814278021 is about 42594.3425938234. The cubic root of 1814278021 is about 1219.6482953318.

The spelling of 1814278021 in words is "one billion, eight hundred fourteen million, two hundred seventy-eight thousand, twenty-one".