669413 has 2 divisors, whose sum is σ = 669414. Its totient is φ = 669412.

The previous prime is 669401. The next prime is 669419. The reversal of 669413 is 314966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669124 + 289 = 818^2 + 17^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669413 is a prime.

It is a super-2 number, since 2×669413² = 896227529138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334706 + 334707.

It is an arithmetic number, because the mean of its divisors is an integer number (334707).

2⁶⁶⁹⁴¹³ is an apocalyptic number.

It is an amenable number.

669413 is a deficient number, since it is larger than the sum of its proper divisors (1).

669413 is an equidigital number, since it uses as much as digits as its factorization.

669413 is an odious number, because the sum of its binary digits is odd.

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

The square root of 669413 is about 818.1766312967. The cubic root of 669413 is about 87.4778392859.

The spelling of 669413 in words is "six hundred sixty-nine thousand, four hundred thirteen".