673966591 has 2 divisors, whose sum is σ = 673966592. Its totient is φ = 673966590.

The previous prime is 673966529. The next prime is 673966609. The reversal of 673966591 is 195669376.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673966591 is a prime.

It is a super-2 number, since 2×673966591² = 908461931568322562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673966291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336983295 + 336983296.

It is an arithmetic number, because the mean of its divisors is an integer number (336983296).

Almost surely, 2^673966591 is an apocalyptic number.

673966591 is a deficient number, since it is larger than the sum of its proper divisors (1).

673966591 is an equidigital number, since it uses as much as digits as its factorization.

673966591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 52.

The square root of 673966591 is about 25960.8665302220. The cubic root of 673966591 is about 876.7574326323.

The spelling of 673966591 in words is "six hundred seventy-three million, nine hundred sixty-six thousand, five hundred ninety-one".