381371989 has 2 divisors, whose sum is σ = 381371990. Its totient is φ = 381371988.

The previous prime is 381371981. The next prime is 381372007. The reversal of 381371989 is 989173183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201356100 + 180015889 = 14190^2 + 13417^2 .

It is an emirp because it is prime and its reverse (989173183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381371989 - 2³ = 381371981 is a prime.

It is a super-2 number, since 2×381371989² = 290889187987632242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381371981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190685994 + 190685995.

It is an arithmetic number, because the mean of its divisors is an integer number (190685995).

Almost surely, 2^381371989 is an apocalyptic number.

It is an amenable number.

381371989 is a deficient number, since it is larger than the sum of its proper divisors (1).

381371989 is an equidigital number, since it uses as much as digits as its factorization.

381371989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 381371989 is about 19528.7477581129. The cubic root of 381371989 is about 725.1863105799.

The spelling of 381371989 in words is "three hundred eighty-one million, three hundred seventy-one thousand, nine hundred eighty-nine".