645147 has 12 divisors (see below), whose sum is σ = 942760. Its totient is φ = 425088.

The previous prime is 645137. The next prime is 645149. The reversal of 645147 is 741546.

645147 is a `hidden beast` number, since 645 + 14 + 7 = 666.

645147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645147 - 2⁴ = 645131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645147.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645147.

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 11 ways as a sum of consecutive naturals, for example, 504 + ... + 1242.

2⁶⁴⁵¹⁴⁷ is an apocalyptic number.

645147 is a deficient number, since it is larger than the sum of its proper divisors (297613).

645147 is a wasteful number, since it uses less digits than its factorization.

645147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 839 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 645147 is about 803.2104331992. The cubic root of 645147 is about 86.4077892926.

The spelling of 645147 in words is "six hundred forty-five thousand, one hundred forty-seven".