646051 has 16 divisors (see below), whose sum is σ = 803520. Its totient is φ = 506880.

The previous prime is 646039. The next prime is 646067. The reversal of 646051 is 150646.

It is a cyclic number.

It is not a de Polignac number, because 646051 - 2¹⁹ = 121763 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (641051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7215 + ... + 7303.

It is an arithmetic number, because the mean of its divisors is an integer number (50220).

2⁶⁴⁶⁰⁵¹ is an apocalyptic number.

646051 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

646051 is a deficient number, since it is larger than the sum of its proper divisors (157469).

646051 is a wasteful number, since it uses less digits than its factorization.

646051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 646051 is about 803.7729778986. The cubic root of 646051 is about 86.4481295485.

Adding to 646051 its reverse (150646), we get a palindrome (796697).

The spelling of 646051 in words is "six hundred forty-six thousand, fifty-one".