645118 has 4 divisors (see below), whose sum is σ = 967680. Its totient is φ = 322558.

The previous prime is 645097. The next prime is 645131. The reversal of 645118 is 811546.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 645092 and 645101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161278 + ... + 161281.

It is an arithmetic number, because the mean of its divisors is an integer number (241920).

2⁶⁴⁵¹¹⁸ is an apocalyptic number.

645118 is a deficient number, since it is larger than the sum of its proper divisors (322562).

645118 is a wasteful number, since it uses less digits than its factorization.

645118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322561.

The product of its digits is 960, while the sum is 25.

The square root of 645118 is about 803.1923804419. The cubic root of 645118 is about 86.4064945678.

The spelling of 645118 in words is "six hundred forty-five thousand, one hundred eighteen".