673668491 has 2 divisors, whose sum is σ = 673668492. Its totient is φ = 673668490.

The previous prime is 673668449. The next prime is 673668497. The reversal of 673668491 is 194866376.

673668491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 673668491 - 2²² = 669474187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (673668497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336834245 + 336834246.

It is an arithmetic number, because the mean of its divisors is an integer number (336834246).

Almost surely, 2^673668491 is an apocalyptic number.

673668491 is a deficient number, since it is larger than the sum of its proper divisors (1).

673668491 is an equidigital number, since it uses as much as digits as its factorization.

673668491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 50.

The square root of 673668491 is about 25955.1245614426. The cubic root of 673668491 is about 876.6281483138.

It can be divided in two parts, 67366 and 8491, that added together give a palindrome (75857).

The spelling of 673668491 in words is "six hundred seventy-three million, six hundred sixty-eight thousand, four hundred ninety-one".