1997089 has 2 divisors, whose sum is σ = 1997090. Its totient is φ = 1997088.

The previous prime is 1997087. The next prime is 1997101. The reversal of 1997089 is 9807991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1710864 + 286225 = 1308^2 + 535^2 .

It is an emirp because it is prime and its reverse (9807991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997089 - 2¹ = 1997087 is a prime.

Together with 1997087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1997081) 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, 998544 + 998545.

It is an arithmetic number, because the mean of its divisors is an integer number (998545).

2^1997089 is an apocalyptic number.

It is an amenable number.

1997089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997089 is an equidigital number, since it uses as much as digits as its factorization.

1997089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 1997089 is about 1413.1839936824. The cubic root of 1997089 is about 125.9309481390.

The spelling of 1997089 in words is "one million, nine hundred ninety-seven thousand, eighty-nine".