646253 has 2 divisors, whose sum is σ = 646254. Its totient is φ = 646252.

The previous prime is 646237. The next prime is 646259. The reversal of 646253 is 352646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644809 + 1444 = 803^2 + 38^2 .

It is a cyclic number.

It is not a de Polignac number, because 646253 - 2⁴ = 646237 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646253.

It is not a weakly prime, because it can be changed into another prime (646259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323126 + 323127.

It is an arithmetic number, because the mean of its divisors is an integer number (323127).

2⁶⁴⁶²⁵³ is an apocalyptic number.

It is an amenable number.

646253 is a deficient number, since it is larger than the sum of its proper divisors (1).

646253 is an equidigital number, since it uses as much as digits as its factorization.

646253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 26.

The square root of 646253 is about 803.8986254498. The cubic root of 646253 is about 86.4571384877.

Adding to 646253 its reverse (352646), we get a palindrome (998899).

The spelling of 646253 in words is "six hundred forty-six thousand, two hundred fifty-three".