881691 has 8 divisors (see below), whose sum is σ = 1180944. Its totient is φ = 585120.

The previous prime is 881681. The next prime is 881707. The reversal of 881691 is 196188.

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

It is not a de Polignac number, because 881691 - 2¹⁰ = 880667 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (881611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301 + ... + 1361.

It is an arithmetic number, because the mean of its divisors is an integer number (147618).

2⁸⁸¹⁶⁹¹ is an apocalyptic number.

881691 is a deficient number, since it is larger than the sum of its proper divisors (299253).

881691 is a wasteful number, since it uses less digits than its factorization.

881691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341.

The product of its digits is 3456, while the sum is 33.

The square root of 881691 is about 938.9840254232. The cubic root of 881691 is about 95.8897388590.

The spelling of 881691 in words is "eight hundred eighty-one thousand, six hundred ninety-one".