646361 has 4 divisors (see below), whose sum is σ = 680400. Its totient is φ = 612324.

The previous prime is 646339. The next prime is 646379. The reversal of 646361 is 163646.

646361 is nontrivially palindromic in base 16.

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 646361 - 2¹⁴ = 629977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646361.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646361.

It is not an unprimeable number, because it can be changed into a prime (646301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16991 + ... + 17028.

It is an arithmetic number, because the mean of its divisors is an integer number (170100).

2⁶⁴⁶³⁶¹ is an apocalyptic number.

It is an amenable number.

646361 is a deficient number, since it is larger than the sum of its proper divisors (34039).

646361 is a wasteful number, since it uses less digits than its factorization.

646361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34038.

The product of its digits is 2592, while the sum is 26.

The square root of 646361 is about 803.9657952923. The cubic root of 646361 is about 86.4619543781.

The spelling of 646361 in words is "six hundred forty-six thousand, three hundred sixty-one".