182820221 has 2 divisors, whose sum is σ = 182820222. Its totient is φ = 182820220.

The previous prime is 182820163. The next prime is 182820257. The reversal of 182820221 is 122028281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169780900 + 13039321 = 13030^2 + 3611^2 .

It is a cyclic number.

It is not a de Polignac number, because 182820221 - 2²² = 178625917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (182880221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91410110 + 91410111.

It is an arithmetic number, because the mean of its divisors is an integer number (91410111).

Almost surely, 2^182820221 is an apocalyptic number.

It is an amenable number.

182820221 is a deficient number, since it is larger than the sum of its proper divisors (1).

182820221 is an equidigital number, since it uses as much as digits as its factorization.

182820221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 182820221 is about 13521.1028026563. The cubic root of 182820221 is about 567.5551600792. Note that the first 3 decimals are identical.

The spelling of 182820221 in words is "one hundred eighty-two million, eight hundred twenty thousand, two hundred twenty-one".