1945609 has 2 divisors, whose sum is σ = 1945610. Its totient is φ = 1945608.

The previous prime is 1945607. The next prime is 1945627. The reversal of 1945609 is 9065491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 41209 = 1380^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945609 - 2¹ = 1945607 is a prime.

Together with 1945607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1945607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972804 + 972805.

It is an arithmetic number, because the mean of its divisors is an integer number (972805).

2^1945609 is an apocalyptic number.

It is an amenable number.

1945609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945609 is an equidigital number, since it uses as much as digits as its factorization.

1945609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 1945609 is about 1394.8508880880. The cubic root of 1945609 is about 124.8394525511.

The spelling of 1945609 in words is "one million, nine hundred forty-five thousand, six hundred nine".