669247 has 2 divisors, whose sum is σ = 669248. Its totient is φ = 669246.

The previous prime is 669241. The next prime is 669271. The reversal of 669247 is 742966.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334623 + 334624.

It is an arithmetic number, because the mean of its divisors is an integer number (334624).

2⁶⁶⁹²⁴⁷ is an apocalyptic number.

669247 is a deficient number, since it is larger than the sum of its proper divisors (1).

669247 is an equidigital number, since it uses as much as digits as its factorization.

669247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 669247 is about 818.0751799193. The cubic root of 669247 is about 87.4706078150.

The spelling of 669247 in words is "six hundred sixty-nine thousand, two hundred forty-seven".