814981 has 4 divisors (see below), whose sum is σ = 830412. Its totient is φ = 799552.

The previous prime is 814949. The next prime is 814991. The reversal of 814981 is 189418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189418 = 2 ⋅94709.

It can be written as a sum of positive squares in 2 ways, for example, as 749956 + 65025 = 866^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 814981 - 2⁵ = 814949 is a prime.

It is a super-2 number, since 2×814981² = 1328388060722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (814901) 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, 7636 + ... + 7741.

It is an arithmetic number, because the mean of its divisors is an integer number (207603).

2⁸¹⁴⁹⁸¹ is an apocalyptic number.

It is an amenable number.

814981 is a deficient number, since it is larger than the sum of its proper divisors (15431).

814981 is a wasteful number, since it uses less digits than its factorization.

814981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15430.

The product of its digits is 2304, while the sum is 31.

The square root of 814981 is about 902.7629810753. The cubic root of 814981 is about 93.4076604642.

The spelling of 814981 in words is "eight hundred fourteen thousand, nine hundred eighty-one".