681187 has 8 divisors (see below), whose sum is σ = 746480. Its totient is φ = 617760.

The previous prime is 681179. The next prime is 681221. The reversal of 681187 is 781186.

681187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 681187 - 2³ = 681179 is a prime.

It is an Ulam number.

It is a Duffinian number.

681187 is a lucky 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 7 ways as a sum of consecutive naturals, for example, 364 + ... + 1222.

It is an arithmetic number, because the mean of its divisors is an integer number (93310).

2⁶⁸¹¹⁸⁷ is an apocalyptic number.

681187 is a deficient number, since it is larger than the sum of its proper divisors (65293).

681187 is a wasteful number, since it uses less digits than its factorization.

681187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933.

The product of its digits is 2688, while the sum is 31.

The square root of 681187 is about 825.3405357790. The cubic root of 681187 is about 87.9877307275.

Subtracting 681187 from its reverse (781186), we obtain a palindrome (99999).

It can be divided in two parts, 681 and 187, that added together give a palindrome (868).

The spelling of 681187 in words is "six hundred eighty-one thousand, one hundred eighty-seven".