681550 has 24 divisors (see below), whose sum is σ = 1301256. Its totient is φ = 265440.

The previous prime is 681539. The next prime is 681557. The reversal of 681550 is 55186.

681550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1992 + ... + 2308.

It is an arithmetic number, because the mean of its divisors is an integer number (54219).

2⁶⁸¹⁵⁵⁰ is an apocalyptic number.

681550 is a deficient number, since it is larger than the sum of its proper divisors (619706).

681550 is a wasteful number, since it uses less digits than its factorization.

681550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 681550 is about 825.5604157177. The cubic root of 681550 is about 88.0033573099.

The spelling of 681550 in words is "six hundred eighty-one thousand, five hundred fifty".