1989613 has 2 divisors, whose sum is σ = 1989614. Its totient is φ = 1989612.

The previous prime is 1989583. The next prime is 1989619. The reversal of 1989613 is 3169891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1408969 + 580644 = 1187^2 + 762^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989613 - 2⁹ = 1989101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994806 + 994807.

It is an arithmetic number, because the mean of its divisors is an integer number (994807).

2^1989613 is an apocalyptic number.

It is an amenable number.

1989613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989613 is an equidigital number, since it uses as much as digits as its factorization.

1989613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The square root of 1989613 is about 1410.5364227839. The cubic root of 1989613 is about 125.7736129733.

The spelling of 1989613 in words is "one million, nine hundred eighty-nine thousand, six hundred thirteen".