381391489 has 2 divisors, whose sum is σ = 381391490. Its totient is φ = 381391488.

The previous prime is 381391457. The next prime is 381391513. The reversal of 381391489 is 984193183.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 292410000 + 88981489 = 17100^2 + 9433^2 .

It is a cyclic number.

It is not a de Polignac number, because 381391489 - 2⁵ = 381391457 is a prime.

It is not a weakly prime, because it can be changed into another prime (381391289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190695744 + 190695745.

It is an arithmetic number, because the mean of its divisors is an integer number (190695745).

Almost surely, 2^381391489 is an apocalyptic number.

It is an amenable number.

381391489 is a deficient number, since it is larger than the sum of its proper divisors (1).

381391489 is an equidigital number, since it uses as much as digits as its factorization.

381391489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 381391489 is about 19529.2470156942. The cubic root of 381391489 is about 725.1986702467.

The spelling of 381391489 in words is "three hundred eighty-one million, three hundred ninety-one thousand, four hundred eighty-nine".