182031221 has 2 divisors, whose sum is σ = 182031222. Its totient is φ = 182031220.

The previous prime is 182031217. The next prime is 182031253. The reversal of 182031221 is 122130281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110544196 + 71487025 = 10514^2 + 8455^2 .

It is a cyclic number.

It is not a de Polignac number, because 182031221 - 2² = 182031217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 182031193 and 182031202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (182031281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91015610 + 91015611.

It is an arithmetic number, because the mean of its divisors is an integer number (91015611).

Almost surely, 2^182031221 is an apocalyptic number.

It is an amenable number.

182031221 is a deficient number, since it is larger than the sum of its proper divisors (1).

182031221 is an equidigital number, since it uses as much as digits as its factorization.

182031221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 182031221 is about 13491.8946408575. The cubic root of 182031221 is about 566.7375139025.

The spelling of 182031221 in words is "one hundred eighty-two million, thirty-one thousand, two hundred twenty-one".