905881 has 4 divisors (see below), whose sum is σ = 926992. Its totient is φ = 884772.

The previous prime is 905843. The next prime is 905897. The reversal of 905881 is 188509.

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, and also an emirpimes, since its reverse is a distinct semiprime: 188509 = 131 ⋅1439.

It is a cyclic number.

It is not a de Polignac number, because 905881 - 2¹⁵ = 873113 is a prime.

It is a super-2 number, since 2×905881² = 1641240772322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (905381) 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 3 ways as a sum of consecutive naturals, for example, 10491 + ... + 10576.

It is an arithmetic number, because the mean of its divisors is an integer number (231748).

2⁹⁰⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

905881 is a deficient number, since it is larger than the sum of its proper divisors (21111).

905881 is a wasteful number, since it uses less digits than its factorization.

905881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21110.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 905881 is about 951.7778102057. Note that the first 3 decimals coincide. The cubic root of 905881 is about 96.7587799478.

The spelling of 905881 in words is "nine hundred five thousand, eight hundred eighty-one".