380871991 has 2 divisors, whose sum is σ = 380871992. Its totient is φ = 380871990.

The previous prime is 380871947. The next prime is 380872003. The reversal of 380871991 is 199178083.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 380871991 - 2²¹ = 378774839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (380872991) 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, 190435995 + 190435996.

It is an arithmetic number, because the mean of its divisors is an integer number (190435996).

Almost surely, 2^380871991 is an apocalyptic number.

380871991 is a deficient number, since it is larger than the sum of its proper divisors (1).

380871991 is an equidigital number, since it uses as much as digits as its factorization.

380871991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 380871991 is about 19515.9419706044. The cubic root of 380871991 is about 724.8692533151.

The spelling of 380871991 in words is "three hundred eighty million, eight hundred seventy-one thousand, nine hundred ninety-one".