673517021 has 2 divisors, whose sum is σ = 673517022. Its totient is φ = 673517020.

The previous prime is 673517017. The next prime is 673517059. The reversal of 673517021 is 120715376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372876100 + 300640921 = 19310^2 + 17339^2 .

It is a cyclic number.

It is not a de Polignac number, because 673517021 - 2² = 673517017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (673517011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336758510 + 336758511.

It is an arithmetic number, because the mean of its divisors is an integer number (336758511).

Almost surely, 2^673517021 is an apocalyptic number.

It is an amenable number.

673517021 is a deficient number, since it is larger than the sum of its proper divisors (1).

673517021 is an equidigital number, since it uses as much as digits as its factorization.

673517021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 673517021 is about 25952.2064765214. The cubic root of 673517021 is about 876.5624420006.

The spelling of 673517021 in words is "six hundred seventy-three million, five hundred seventeen thousand, twenty-one".