669287429 has 2 divisors, whose sum is σ = 669287430. Its totient is φ = 669287428.

The previous prime is 669287371. The next prime is 669287431. The reversal of 669287429 is 924782966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668481025 + 806404 = 25855^2 + 898^2 .

It is a cyclic number.

It is not a de Polignac number, because 669287429 - 2⁸ = 669287173 is a prime.

It is a Sophie Germain prime.

Together with 669287431, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669287459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334643714 + 334643715.

It is an arithmetic number, because the mean of its divisors is an integer number (334643715).

Almost surely, 2^669287429 is an apocalyptic number.

It is an amenable number.

669287429 is a deficient number, since it is larger than the sum of its proper divisors (1).

669287429 is an equidigital number, since it uses as much as digits as its factorization.

669287429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The square root of 669287429 is about 25870.5900396570. The cubic root of 669287429 is about 874.7236913683.

The spelling of 669287429 in words is "six hundred sixty-nine million, two hundred eighty-seven thousand, four hundred twenty-nine".