681253 has 2 divisors, whose sum is σ = 681254. Its totient is φ = 681252.

The previous prime is 681251. The next prime is 681257. The reversal of 681253 is 352186.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 567009 + 114244 = 753^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 681253 - 2¹ = 681251 is a prime.

Together with 681251, it forms a pair of twin primes.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁵ + 8⁶ + 2¹⁰ + 1 + 5⁸ + 3⁹ .

681253 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340626 + 340627.

It is an arithmetic number, because the mean of its divisors is an integer number (340627).

2⁶⁸¹²⁵³ is an apocalyptic number.

It is an amenable number.

681253 is a deficient number, since it is larger than the sum of its proper divisors (1).

681253 is an equidigital number, since it uses as much as digits as its factorization.

681253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 681253 is about 825.3805183066. The cubic root of 681253 is about 87.9905723371.

The spelling of 681253 in words is "six hundred eighty-one thousand, two hundred fifty-three".