645195 has 8 divisors (see below), whose sum is σ = 1032336. Its totient is φ = 344096.

The previous prime is 645187. The next prime is 645233. The reversal of 645195 is 591546.

645195 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 645195 - 2³ = 645187 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21492 + ... + 21521.

It is an arithmetic number, because the mean of its divisors is an integer number (129042).

2⁶⁴⁵¹⁹⁵ is an apocalyptic number.

645195 is a deficient number, since it is larger than the sum of its proper divisors (387141).

645195 is a wasteful number, since it uses less digits than its factorization.

645195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43021.

The product of its digits is 5400, while the sum is 30.

The square root of 645195 is about 803.2403127334. The cubic root of 645195 is about 86.4099322001.

The spelling of 645195 in words is "six hundred forty-five thousand, one hundred ninety-five".