645514 has 4 divisors (see below), whose sum is σ = 968274. Its totient is φ = 322756.

The previous prime is 645503. The next prime is 645521. The reversal of 645514 is 415546.

645514 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 378225 + 267289 = 615^2 + 517^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161377 + ... + 161380.

2⁶⁴⁵⁵¹⁴ is an apocalyptic number.

645514 is a deficient number, since it is larger than the sum of its proper divisors (322760).

645514 is a wasteful number, since it uses less digits than its factorization.

645514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322759.

The product of its digits is 2400, while the sum is 25.

The square root of 645514 is about 803.4388589059. The cubic root of 645514 is about 86.4241709066.

The spelling of 645514 in words is "six hundred forty-five thousand, five hundred fourteen".