681916 has 12 divisors (see below), whose sum is σ = 1202320. Its totient is φ = 338400.

The previous prime is 681913. The next prime is 681931. The reversal of 681916 is 619186.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681913) 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, 40 + ... + 1168.

2⁶⁸¹⁹¹⁶ is an apocalyptic number.

It is an amenable number.

681916 is a deficient number, since it is larger than the sum of its proper divisors (520404).

681916 is a wasteful number, since it uses less digits than its factorization.

681916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284 (or 1282 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 681916 is about 825.7820535710. The cubic root of 681916 is about 88.0191074212.

The spelling of 681916 in words is "six hundred eighty-one thousand, nine hundred sixteen".