645347 has 2 divisors, whose sum is σ = 645348. Its totient is φ = 645346.

The previous prime is 645329. The next prime is 645353. The reversal of 645347 is 743546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645347 - 2⁸ = 645091 is a prime.

It is a Chen prime.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645347.

It is not a weakly prime, because it can be changed into another prime (645367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322673 + 322674.

It is an arithmetic number, because the mean of its divisors is an integer number (322674).

2⁶⁴⁵³⁴⁷ is an apocalyptic number.

645347 is a deficient number, since it is larger than the sum of its proper divisors (1).

645347 is an equidigital number, since it uses as much as digits as its factorization.

645347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 29.

The square root of 645347 is about 803.3349239265. The cubic root of 645347 is about 86.4167173727.

The spelling of 645347 in words is "six hundred forty-five thousand, three hundred forty-seven".