383219981 has 2 divisors, whose sum is σ = 383219982. Its totient is φ = 383219980.

The previous prime is 383219959. The next prime is 383220037. The reversal of 383219981 is 189912383.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310816900 + 72403081 = 17630^2 + 8509^2 .

It is a cyclic number.

It is not a de Polignac number, because 383219981 - 2²² = 379025677 is a prime.

It is a super-2 number, since 2×383219981² = 293715107675280722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (383219281) 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, 191609990 + 191609991.

It is an arithmetic number, because the mean of its divisors is an integer number (191609991).

Almost surely, 2^383219981 is an apocalyptic number.

It is an amenable number.

383219981 is a deficient number, since it is larger than the sum of its proper divisors (1).

383219981 is an equidigital number, since it uses as much as digits as its factorization.

383219981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 383219981 is about 19576.0052360026. The cubic root of 383219981 is about 726.3557547072.

The spelling of 383219981 in words is "three hundred eighty-three million, two hundred nineteen thousand, nine hundred eighty-one".