681081 has 4 divisors (see below), whose sum is σ = 908112. Its totient is φ = 454052.

The previous prime is 681067. The next prime is 681089. The reversal of 681081 is 180186.

681081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681081 - 2⁵ = 681049 is a prime.

It is a super-2 number, since 2×681081² = 927742657122, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (681089) 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, 113511 + ... + 113516.

It is an arithmetic number, because the mean of its divisors is an integer number (227028).

2⁶⁸¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

681081 is a deficient number, since it is larger than the sum of its proper divisors (227031).

681081 is a wasteful number, since it uses less digits than its factorization.

681081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227030.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 681081 is about 825.2763173629. The cubic root of 681081 is about 87.9831665460.

The spelling of 681081 in words is "six hundred eighty-one thousand, eighty-one".