383449681 has 2 divisors, whose sum is σ = 383449682. Its totient is φ = 383449680.

The previous prime is 383449657. The next prime is 383449723. The reversal of 383449681 is 186944383.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354192400 + 29257281 = 18820^2 + 5409^2 .

It is an emirp because it is prime and its reverse (186944383) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 383449681 - 2¹⁷ = 383318609 is a prime.

It is a super-2 number, since 2×383449681² = 294067315718003522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (383449481) 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, 191724840 + 191724841.

It is an arithmetic number, because the mean of its divisors is an integer number (191724841).

Almost surely, 2^383449681 is an apocalyptic number.

It is an amenable number.

383449681 is a deficient number, since it is larger than the sum of its proper divisors (1).

383449681 is an equidigital number, since it uses as much as digits as its factorization.

383449681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 46.

The square root of 383449681 is about 19581.8712333628. The cubic root of 383449681 is about 726.5008503017.

The spelling of 383449681 in words is "three hundred eighty-three million, four hundred forty-nine thousand, six hundred eighty-one".