812881 has 4 divisors (see below), whose sum is σ = 818032. Its totient is φ = 807732.

The previous prime is 812869. The next prime is 812921. The reversal of 812881 is 188218.

812881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 188218 = 2 ⋅94109.

It is a cyclic number.

It is not a de Polignac number, because 812881 - 2⁵ = 812849 is a prime.

It is a super-2 number, since 2×812881² = 1321551040322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812081) 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, 2331 + ... + 2656.

It is an arithmetic number, because the mean of its divisors is an integer number (204508).

2⁸¹²⁸⁸¹ is an apocalyptic number.

It is an amenable number.

812881 is a deficient number, since it is larger than the sum of its proper divisors (5151).

812881 is a wasteful number, since it uses less digits than its factorization.

812881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5150.

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

The square root of 812881 is about 901.5991348709. The cubic root of 812881 is about 93.3273621463.

The spelling of 812881 in words is "eight hundred twelve thousand, eight hundred eighty-one".