1669073213 has 2 divisors, whose sum is σ = 1669073214. Its totient is φ = 1669073212.

The previous prime is 1669073179. The next prime is 1669073239. The reversal of 1669073213 is 3123709661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1457865124 + 211208089 = 38182^2 + 14533^2 .

It is an emirp because it is prime and its reverse (3123709661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1669073213 - 2⁸ = 1669072957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669043213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834536606 + 834536607.

It is an arithmetic number, because the mean of its divisors is an integer number (834536607).

Almost surely, 2^1669073213 is an apocalyptic number.

It is an amenable number.

1669073213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669073213 is an equidigital number, since it uses as much as digits as its factorization.

1669073213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 1669073213 is about 40854.2924672549. The cubic root of 1669073213 is about 1186.2014822911.

The spelling of 1669073213 in words is "one billion, six hundred sixty-nine million, seventy-three thousand, two hundred thirteen".