811618321 has 2 divisors, whose sum is σ = 811618322. Its totient is φ = 811618320.

The previous prime is 811618259. The next prime is 811618363. The reversal of 811618321 is 123816118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668481025 + 143137296 = 25855^2 + 11964^2 .

It is a cyclic number.

It is not a de Polignac number, because 811618321 - 2¹⁷ = 811487249 is a prime.

It is not a weakly prime, because it can be changed into another prime (811618121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405809160 + 405809161.

It is an arithmetic number, because the mean of its divisors is an integer number (405809161).

Almost surely, 2^811618321 is an apocalyptic number.

It is an amenable number.

811618321 is a deficient number, since it is larger than the sum of its proper divisors (1).

811618321 is an equidigital number, since it uses as much as digits as its factorization.

811618321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 31.

The square root of 811618321 is about 28488.9157568343. The cubic root of 811618321 is about 932.7901412269.

The spelling of 811618321 in words is "eight hundred eleven million, six hundred eighteen thousand, three hundred twenty-one".