673946813 has 2 divisors, whose sum is σ = 673946814. Its totient is φ = 673946812.

The previous prime is 673946753. The next prime is 673946821. The reversal of 673946813 is 318649376.

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., 614147524 + 59799289 = 24782^2 + 7733^2 .

It is a cyclic number.

It is not a de Polignac number, because 673946813 - 2²² = 669752509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673946843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336973406 + 336973407.

It is an arithmetic number, because the mean of its divisors is an integer number (336973407).

Almost surely, 2^673946813 is an apocalyptic number.

It is an amenable number.

673946813 is a deficient number, since it is larger than the sum of its proper divisors (1).

673946813 is an equidigital number, since it uses as much as digits as its factorization.

673946813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 673946813 is about 25960.4856079388. The cubic root of 673946813 is about 876.7488562041.

The spelling of 673946813 in words is "six hundred seventy-three million, nine hundred forty-six thousand, eight hundred thirteen".