381137689 has 2 divisors, whose sum is σ = 381137690. Its totient is φ = 381137688.

The previous prime is 381137657. The next prime is 381137723. The reversal of 381137689 is 986731183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 292683664 + 88454025 = 17108^2 + 9405^2 .

It is a cyclic number.

It is not a de Polignac number, because 381137689 - 2⁵ = 381137657 is a prime.

It is not a weakly prime, because it can be changed into another prime (387137689) 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, 190568844 + 190568845.

It is an arithmetic number, because the mean of its divisors is an integer number (190568845).

Almost surely, 2^381137689 is an apocalyptic number.

It is an amenable number.

381137689 is a deficient number, since it is larger than the sum of its proper divisors (1).

381137689 is an equidigital number, since it uses as much as digits as its factorization.

381137689 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 381137689 is about 19522.7479879242. The cubic root of 381137689 is about 725.0377714764.

The spelling of 381137689 in words is "three hundred eighty-one million, one hundred thirty-seven thousand, six hundred eighty-nine".