381391607 has 2 divisors, whose sum is σ = 381391608. Its totient is φ = 381391606.

The previous prime is 381391603. The next prime is 381391609. The reversal of 381391607 is 706193183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381391607 - 2² = 381391603 is a prime.

Together with 381391609, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381391603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190695803 + 190695804.

It is an arithmetic number, because the mean of its divisors is an integer number (190695804).

Almost surely, 2^381391607 is an apocalyptic number.

381391607 is a deficient number, since it is larger than the sum of its proper divisors (1).

381391607 is an equidigital number, since it uses as much as digits as its factorization.

381391607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 381391607 is about 19529.2500368038. The cubic root of 381391607 is about 725.1987450372.

The spelling of 381391607 in words is "three hundred eighty-one million, three hundred ninety-one thousand, six hundred seven".