1889081 has 2 divisors, whose sum is σ = 1889082. Its totient is φ = 1889080.

The previous prime is 1889077. The next prime is 1889087. The reversal of 1889081 is 1809881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 714025 = 1084^2 + 845^2 .

It is an emirp because it is prime and its reverse (1809881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1889081 - 2² = 1889077 is a prime.

It is a super-2 number, since 2×1889081² = 7137254049122, which contains 22 as substring.

It is a Sophie Germain prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1889087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944540 + 944541.

It is an arithmetic number, because the mean of its divisors is an integer number (944541).

2^1889081 is an apocalyptic number.

It is an amenable number.

1889081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889081 is an equidigital number, since it uses as much as digits as its factorization.

1889081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1889081 is about 1374.4384307782. The cubic root of 1889081 is about 123.6185162682.

The spelling of 1889081 in words is "one million, eight hundred eighty-nine thousand, eighty-one".