881821 has 4 divisors (see below), whose sum is σ = 905692. Its totient is φ = 857952.

The previous prime is 881813. The next prime is 881833. The reversal of 881821 is 128188.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 783225 + 98596 = 885^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 881821 - 2³ = 881813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 881821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (885821) 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, 11880 + ... + 11953.

It is an arithmetic number, because the mean of its divisors is an integer number (226423).

2⁸⁸¹⁸²¹ is an apocalyptic number.

It is an amenable number.

881821 is a deficient number, since it is larger than the sum of its proper divisors (23871).

881821 is a wasteful number, since it uses less digits than its factorization.

881821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23870.

The product of its digits is 1024, while the sum is 28.

The square root of 881821 is about 939.0532466266. The cubic root of 881821 is about 95.8944514146.

The spelling of 881821 in words is "eight hundred eighty-one thousand, eight hundred twenty-one".