382881991 has 2 divisors, whose sum is σ = 382881992. Its totient is φ = 382881990.

The previous prime is 382881971. The next prime is 382882001. The reversal of 382881991 is 199188283.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 382881991 - 2⁵ = 382881959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (382881931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191440995 + 191440996.

It is an arithmetic number, because the mean of its divisors is an integer number (191440996).

Almost surely, 2^382881991 is an apocalyptic number.

382881991 is a deficient number, since it is larger than the sum of its proper divisors (1).

382881991 is an equidigital number, since it uses as much as digits as its factorization.

382881991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 49.

The square root of 382881991 is about 19567.3705693943. The cubic root of 382881991 is about 726.1421496377.

The spelling of 382881991 in words is "three hundred eighty-two million, eight hundred eighty-one thousand, nine hundred ninety-one".