1814561321 has 2 divisors, whose sum is σ = 1814561322. Its totient is φ = 1814561320.

The previous prime is 1814561299. The next prime is 1814561323. The reversal of 1814561321 is 1231654181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1327873600 + 486687721 = 36440^2 + 22061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1814561321 is a prime.

Together with 1814561323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1814561323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907280660 + 907280661.

It is an arithmetic number, because the mean of its divisors is an integer number (907280661).

Almost surely, 2^1814561321 is an apocalyptic number.

It is an amenable number.

1814561321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1814561321 is an equidigital number, since it uses as much as digits as its factorization.

1814561321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 32.

The square root of 1814561321 is about 42597.6680230268. The cubic root of 1814561321 is about 1219.7117748307.

The spelling of 1814561321 in words is "one billion, eight hundred fourteen million, five hundred sixty-one thousand, three hundred twenty-one".