383881691 has 2 divisors, whose sum is σ = 383881692. Its totient is φ = 383881690.

The previous prime is 383881651. The next prime is 383881717. The reversal of 383881691 is 196188383.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 383881691 - 2⁶ = 383881627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (383881651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191940845 + 191940846.

It is an arithmetic number, because the mean of its divisors is an integer number (191940846).

Almost surely, 2^383881691 is an apocalyptic number.

383881691 is a deficient number, since it is larger than the sum of its proper divisors (1).

383881691 is an equidigital number, since it uses as much as digits as its factorization.

383881691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 383881691 is about 19592.8989942785. The cubic root of 383881691 is about 726.7735830348.

The spelling of 383881691 in words is "three hundred eighty-three million, eight hundred eighty-one thousand, six hundred ninety-one".