383871217 has 2 divisors, whose sum is σ = 383871218. Its totient is φ = 383871216.

The previous prime is 383871197. The next prime is 383871221. The reversal of 383871217 is 712178383.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199346161 + 184525056 = 14119^2 + 13584^2 .

It is a cyclic number.

It is not a de Polignac number, because 383871217 - 2¹⁵ = 383838449 is a prime.

It is a super-2 number, since 2×383871217² = 294714222482122178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 383871217.

It is not a weakly prime, because it can be changed into another prime (383871247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191935608 + 191935609.

It is an arithmetic number, because the mean of its divisors is an integer number (191935609).

Almost surely, 2^383871217 is an apocalyptic number.

It is an amenable number.

383871217 is a deficient number, since it is larger than the sum of its proper divisors (1).

383871217 is an equidigital number, since it uses as much as digits as its factorization.

383871217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 383871217 is about 19592.6317017393. The cubic root of 383871217 is about 726.7669731027.

The spelling of 383871217 in words is "three hundred eighty-three million, eight hundred seventy-one thousand, two hundred seventeen".