645117 has 16 divisors (see below), whose sum is σ = 952128. Its totient is φ = 385280.

The previous prime is 645097. The next prime is 645131. The reversal of 645117 is 711546.

It is a cyclic number.

It is not a de Polignac number, because 645117 - 2¹⁵ = 612349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3643 + ... + 3815.

It is an arithmetic number, because the mean of its divisors is an integer number (59508).

2⁶⁴⁵¹¹⁷ is an apocalyptic number.

It is an amenable number.

645117 is a deficient number, since it is larger than the sum of its proper divisors (307011).

645117 is a wasteful number, since it uses less digits than its factorization.

645117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300.

The product of its digits is 840, while the sum is 24.

The square root of 645117 is about 803.1917579258. The cubic root of 645117 is about 86.4064499214.

The spelling of 645117 in words is "six hundred forty-five thousand, one hundred seventeen".