669784931 has 2 divisors, whose sum is σ = 669784932. Its totient is φ = 669784930.

The previous prime is 669784867. The next prime is 669784937. The reversal of 669784931 is 139487966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669784931 - 2⁶ = 669784867 is a prime.

It is a super-2 number, since 2×669784931² = 897223707589349522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669784937) 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, 334892465 + 334892466.

It is an arithmetic number, because the mean of its divisors is an integer number (334892466).

Almost surely, 2^669784931 is an apocalyptic number.

669784931 is a deficient number, since it is larger than the sum of its proper divisors (1).

669784931 is an equidigital number, since it uses as much as digits as its factorization.

669784931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 53.

The square root of 669784931 is about 25880.2034574692. The cubic root of 669784931 is about 874.9403740594.

The spelling of 669784931 in words is "six hundred sixty-nine million, seven hundred eighty-four thousand, nine hundred thirty-one".