673643959 has 2 divisors, whose sum is σ = 673643960. Its totient is φ = 673643958.

The previous prime is 673643909. The next prime is 673643983. The reversal of 673643959 is 959346376.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673643959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673643909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336821979 + 336821980.

It is an arithmetic number, because the mean of its divisors is an integer number (336821980).

Almost surely, 2^673643959 is an apocalyptic number.

673643959 is a deficient number, since it is larger than the sum of its proper divisors (1).

673643959 is an equidigital number, since it uses as much as digits as its factorization.

673643959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 52.

The square root of 673643959 is about 25954.6519722380. The cubic root of 673643959 is about 876.6175072230.

The spelling of 673643959 in words is "six hundred seventy-three million, six hundred forty-three thousand, nine hundred fifty-nine".