402220171 has 2 divisors, whose sum is σ = 402220172. Its totient is φ = 402220170.

The previous prime is 402220157. The next prime is 402220207. The reversal of 402220171 is 171022204.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402220171 - 2⁷ = 402220043 is a prime.

It is not a weakly prime, because it can be changed into another prime (402220121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201110085 + 201110086.

It is an arithmetic number, because the mean of its divisors is an integer number (201110086).

Almost surely, 2^402220171 is an apocalyptic number.

402220171 is a deficient number, since it is larger than the sum of its proper divisors (1).

402220171 is an equidigital number, since it uses as much as digits as its factorization.

402220171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 402220171 is about 20055.4274698895. The cubic root of 402220171 is about 738.1669820179.

Adding to 402220171 its reverse (171022204), we get a palindrome (573242375).

The spelling of 402220171 in words is "four hundred two million, two hundred twenty thousand, one hundred seventy-one".