645187 has 2 divisors, whose sum is σ = 645188. Its totient is φ = 645186.

The previous prime is 645179. The next prime is 645233. The reversal of 645187 is 781546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645187 - 2³ = 645179 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322593 + 322594.

It is an arithmetic number, because the mean of its divisors is an integer number (322594).

2⁶⁴⁵¹⁸⁷ is an apocalyptic number.

645187 is a deficient number, since it is larger than the sum of its proper divisors (1).

645187 is an equidigital number, since it uses as much as digits as its factorization.

645187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 645187 is about 803.2353328882. The cubic root of 645187 is about 86.4095750562.

The spelling of 645187 in words is "six hundred forty-five thousand, one hundred eighty-seven".