1889561 has 2 divisors, whose sum is σ = 1889562. Its totient is φ = 1889560.

The previous prime is 1889551. The next prime is 1889579. The reversal of 1889561 is 1659881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1177225 + 712336 = 1085^2 + 844^2 .

It is an emirp because it is prime and its reverse (1659881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1889561 - 2⁶ = 1889497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1889501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944780 + 944781.

It is an arithmetic number, because the mean of its divisors is an integer number (944781).

2^1889561 is an apocalyptic number.

It is an amenable number.

1889561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889561 is an equidigital number, since it uses as much as digits as its factorization.

1889561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 38.

The square root of 1889561 is about 1374.6130364579. The cubic root of 1889561 is about 123.6289855321.

The spelling of 1889561 in words is "one million, eight hundred eighty-nine thousand, five hundred sixty-one".