664319 has 2 divisors, whose sum is σ = 664320. Its totient is φ = 664318.

The previous prime is 664289. The next prime is 664331. The reversal of 664319 is 913466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664319 - 2¹⁶ = 598783 is a prime.

It is a super-2 number, since 2×664319² = 882639467522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 664291 and 664300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332159 + 332160.

It is an arithmetic number, because the mean of its divisors is an integer number (332160).

2⁶⁶⁴³¹⁹ is an apocalyptic number.

664319 is a deficient number, since it is larger than the sum of its proper divisors (1).

664319 is an equidigital number, since it uses as much as digits as its factorization.

664319 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 664319 is about 815.0576666715. The cubic root of 664319 is about 87.2553820814.

The spelling of 664319 in words is "six hundred sixty-four thousand, three hundred nineteen".