1645045089 has 8 divisors (see below), whose sum is σ = 2196068352. Its totient is φ = 1095359280.

The previous prime is 1645045013. The next prime is 1645045121. The reversal of 1645045089 is 9805405461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1645045089 - 2¹⁵ = 1645012321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645045089.

It is not an unprimeable number, because it can be changed into a prime (1645043089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331489 + ... + 336414.

It is an arithmetic number, because the mean of its divisors is an integer number (274508544).

Almost surely, 2^1645045089 is an apocalyptic number.

It is an amenable number.

1645045089 is a deficient number, since it is larger than the sum of its proper divisors (551023263).

1645045089 is an equidigital number, since it uses as much as digits as its factorization.

1645045089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668727.

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 1645045089 is about 40559.1554275974. The cubic root of 1645045089 is about 1180.4817263705.

The spelling of 1645045089 in words is "one billion, six hundred forty-five million, forty-five thousand, eighty-nine".