681211 has 4 divisors (see below), whose sum is σ = 682992. Its totient is φ = 679432.

The previous prime is 681179. The next prime is 681221. The reversal of 681211 is 112186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112186 = 2 ⋅56093.

It is a cyclic number.

It is not a de Polignac number, because 681211 - 2⁵ = 681179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681221) 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, 55 + ... + 1168.

It is an arithmetic number, because the mean of its divisors is an integer number (170748).

2⁶⁸¹²¹¹ is an apocalyptic number.

681211 is a deficient number, since it is larger than the sum of its proper divisors (1781).

681211 is a wasteful number, since it uses less digits than its factorization.

681211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780.

The product of its digits is 96, while the sum is 19.

The square root of 681211 is about 825.3550751040. The cubic root of 681211 is about 87.9887640613.

Adding to 681211 its reverse (112186), we get a palindrome (793397).

The spelling of 681211 in words is "six hundred eighty-one thousand, two hundred eleven".