673392521 has 2 divisors, whose sum is σ = 673392522. Its totient is φ = 673392520.

The previous prime is 673392493. The next prime is 673392523. The reversal of 673392521 is 125293376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 527345296 + 146047225 = 22964^2 + 12085^2 .

It is a cyclic number.

It is not a de Polignac number, because 673392521 - 2¹⁸ = 673130377 is a prime.

Together with 673392523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (673392523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336696260 + 336696261.

It is an arithmetic number, because the mean of its divisors is an integer number (336696261).

Almost surely, 2^673392521 is an apocalyptic number.

It is an amenable number.

673392521 is a deficient number, since it is larger than the sum of its proper divisors (1).

673392521 is an equidigital number, since it uses as much as digits as its factorization.

673392521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 38.

The square root of 673392521 is about 25949.8077256846. The cubic root of 673392521 is about 876.5084276522.

The spelling of 673392521 in words is "six hundred seventy-three million, three hundred ninety-two thousand, five hundred twenty-one".