1669945931 has 2 divisors, whose sum is σ = 1669945932. Its totient is φ = 1669945930.

The previous prime is 1669945909. The next prime is 1669945933. The reversal of 1669945931 is 1395499661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669945931 is a prime.

It is a super-4 number, since 4×1669945931⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 1669945933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1669945933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834972965 + 834972966.

It is an arithmetic number, because the mean of its divisors is an integer number (834972966).

Almost surely, 2^1669945931 is an apocalyptic number.

1669945931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669945931 is an equidigital number, since it uses as much as digits as its factorization.

1669945931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 53.

The square root of 1669945931 is about 40864.9719319615. The cubic root of 1669945931 is about 1186.4081916192.

The spelling of 1669945931 in words is "one billion, six hundred sixty-nine million, nine hundred forty-five thousand, nine hundred thirty-one".