664193 has 2 divisors, whose sum is σ = 664194. Its totient is φ = 664192.

The previous prime is 664177. The next prime is 664199. The reversal of 664193 is 391466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628849 + 35344 = 793^2 + 188^2 .

It is a cyclic number.

It is not a de Polignac number, because 664193 - 2⁴ = 664177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (664199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332096 + 332097.

It is an arithmetic number, because the mean of its divisors is an integer number (332097).

2⁶⁶⁴¹⁹³ is an apocalyptic number.

It is an amenable number.

664193 is a deficient number, since it is larger than the sum of its proper divisors (1).

664193 is an equidigital number, since it uses as much as digits as its factorization.

664193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 664193 is about 814.9803678617. The cubic root of 664193 is about 87.2498652171.

The spelling of 664193 in words is "six hundred sixty-four thousand, one hundred ninety-three".