681121 has 4 divisors (see below), whose sum is σ = 778432. Its totient is φ = 583812.

The previous prime is 681113. The next prime is 681127. The reversal of 681121 is 121186.

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 681121 - 2³ = 681113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681127) 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, 48645 + ... + 48658.

It is an arithmetic number, because the mean of its divisors is an integer number (194608).

2⁶⁸¹¹²¹ is an apocalyptic number.

It is an amenable number.

681121 is a deficient number, since it is larger than the sum of its proper divisors (97311).

681121 is an equidigital number, since it uses as much as digits as its factorization.

681121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97310.

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

The square root of 681121 is about 825.3005513145. The cubic root of 681121 is about 87.9848889343.

The spelling of 681121 in words is "six hundred eighty-one thousand, one hundred twenty-one".