1645123 has 2 divisors, whose sum is σ = 1645124. Its totient is φ = 1645122.

The previous prime is 1645099. The next prime is 1645129. The reversal of 1645123 is 3215461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645123 - 2⁹ = 1644611 is a prime.

1645123 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1645094 and 1645103.

It is not a weakly prime, because it can be changed into another prime (1645129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822561 + 822562.

It is an arithmetic number, because the mean of its divisors is an integer number (822562).

2^1645123 is an apocalyptic number.

1645123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645123 is an equidigital number, since it uses as much as digits as its factorization.

1645123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 1645123 is about 1282.6234833341. The cubic root of 1645123 is about 118.0500362346.

The spelling of 1645123 in words is "one million, six hundred forty-five thousand, one hundred twenty-three".