646311 has 8 divisors (see below), whose sum is σ = 871024. Its totient is φ = 426240.

The previous prime is 646309. The next prime is 646339. The reversal of 646311 is 113646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 646311 - 2¹ = 646309 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 820 + ... + 1401.

It is an arithmetic number, because the mean of its divisors is an integer number (108878).

2⁶⁴⁶³¹¹ is an apocalyptic number.

646311 is a deficient number, since it is larger than the sum of its proper divisors (224713).

646311 is a wasteful number, since it uses less digits than its factorization.

646311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321.

The product of its digits is 432, while the sum is 21.

The square root of 646311 is about 803.9346988406. The cubic root of 646311 is about 86.4597248659.

Adding to 646311 its reverse (113646), we get a palindrome (759957).

The spelling of 646311 in words is "six hundred forty-six thousand, three hundred eleven".