881521 has 4 divisors (see below), whose sum is σ = 919872. Its totient is φ = 843172.

The previous prime is 881509. The next prime is 881527. The reversal of 881521 is 125188.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 881521 - 2⁷ = 881393 is a prime.

It is a Duffinian number.

881521 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (881527) 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, 19141 + ... + 19186.

It is an arithmetic number, because the mean of its divisors is an integer number (229968).

2⁸⁸¹⁵²¹ is an apocalyptic number.

It is an amenable number.

881521 is a deficient number, since it is larger than the sum of its proper divisors (38351).

881521 is a wasteful number, since it uses less digits than its factorization.

881521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38350.

The product of its digits is 640, while the sum is 25.

The square root of 881521 is about 938.8934976876. The cubic root of 881521 is about 95.8835755874.

It can be divided in two parts, 8815 and 21, that added together give a square (8836 = 94²).

The spelling of 881521 in words is "eight hundred eighty-one thousand, five hundred twenty-one".