646197 has 4 divisors (see below), whose sum is σ = 861600. Its totient is φ = 430796.

The previous prime is 646193. The next prime is 646199. The reversal of 646197 is 791646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646197 - 2² = 646193 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646193) 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 in 3 ways as a sum of consecutive naturals, for example, 107697 + ... + 107702.

It is an arithmetic number, because the mean of its divisors is an integer number (215400).

2⁶⁴⁶¹⁹⁷ is an apocalyptic number.

It is an amenable number.

646197 is a deficient number, since it is larger than the sum of its proper divisors (215403).

646197 is a wasteful number, since it uses less digits than its factorization.

646197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215402.

The product of its digits is 9072, while the sum is 33.

The square root of 646197 is about 803.8637944329. The cubic root of 646197 is about 86.4546411481.

The spelling of 646197 in words is "six hundred forty-six thousand, one hundred ninety-seven".