669731087 has 2 divisors, whose sum is σ = 669731088. Its totient is φ = 669731086.

The previous prime is 669731033. The next prime is 669731093. The reversal of 669731087 is 780137966.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669731087 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669731287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334865543 + 334865544.

It is an arithmetic number, because the mean of its divisors is an integer number (334865544).

Almost surely, 2^669731087 is an apocalyptic number.

669731087 is a deficient number, since it is larger than the sum of its proper divisors (1).

669731087 is an equidigital number, since it uses as much as digits as its factorization.

669731087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 669731087 is about 25879.1631819887. The cubic root of 669731087 is about 874.9169279502.

The spelling of 669731087 in words is "six hundred sixty-nine million, seven hundred thirty-one thousand, eighty-seven".