381887291 has 2 divisors, whose sum is σ = 381887292. Its totient is φ = 381887290.

The previous prime is 381887287. The next prime is 381887347. The reversal of 381887291 is 192788183.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 381887291 - 2² = 381887287 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381887591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190943645 + 190943646.

It is an arithmetic number, because the mean of its divisors is an integer number (190943646).

Almost surely, 2^381887291 is an apocalyptic number.

381887291 is a deficient number, since it is larger than the sum of its proper divisors (1).

381887291 is an equidigital number, since it uses as much as digits as its factorization.

381887291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 47.

The square root of 381887291 is about 19541.9367259236. The cubic root of 381887291 is about 725.5127825337.

The spelling of 381887291 in words is "three hundred eighty-one million, eight hundred eighty-seven thousand, two hundred ninety-one".