381187693 has 2 divisors, whose sum is σ = 381187694. Its totient is φ = 381187692.

The previous prime is 381187691. The next prime is 381187739. The reversal of 381187693 is 396781183.

It is an a-pointer prime, because the next prime (381187739) can be obtained adding 381187693 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211615209 + 169572484 = 14547^2 + 13022^2 .

It is a cyclic number.

It is not a de Polignac number, because 381187693 - 2¹ = 381187691 is a prime.

Together with 381187691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381187691) 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, 190593846 + 190593847.

It is an arithmetic number, because the mean of its divisors is an integer number (190593847).

Almost surely, 2^381187693 is an apocalyptic number.

It is an amenable number.

381187693 is a deficient number, since it is larger than the sum of its proper divisors (1).

381187693 is an equidigital number, since it uses as much as digits as its factorization.

381187693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 381187693 is about 19524.0286057975. The cubic root of 381187693 is about 725.0694776064.

The spelling of 381187693 in words is "three hundred eighty-one million, one hundred eighty-seven thousand, six hundred ninety-three".