645119 has 4 divisors (see below), whose sum is σ = 647400. Its totient is φ = 642840.

The previous prime is 645097. The next prime is 645131. The reversal of 645119 is 911546.

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

It is a cyclic number.

It is not a de Polignac number, because 645119 - 2⁸ = 644863 is a prime.

It is a super-2 number, since 2×645119² = 832357048322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644 + ... + 1305.

It is an arithmetic number, because the mean of its divisors is an integer number (161850).

2⁶⁴⁵¹¹⁹ is an apocalyptic number.

645119 is a deficient number, since it is larger than the sum of its proper divisors (2281).

645119 is a wasteful number, since it uses less digits than its factorization.

645119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280.

The product of its digits is 1080, while the sum is 26.

The square root of 645119 is about 803.1930029576. The cubic root of 645119 is about 86.4065392141.

The spelling of 645119 in words is "six hundred forty-five thousand, one hundred nineteen".