810981 has 12 divisors (see below), whose sum is σ = 1179360. Its totient is φ = 537000.

The previous prime is 810973. The next prime is 810989. The reversal of 810981 is 189018.

It is an interprime number because it is at equal distance from previous prime (810973) and next prime (810989).

It is not a de Polignac number, because 810981 - 2³ = 810973 is a prime.

It is a super-2 number, since 2×810981² = 1315380364722, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2080 + ... + 2438.

It is an arithmetic number, because the mean of its divisors is an integer number (98280).

2⁸¹⁰⁹⁸¹ is an apocalyptic number.

It is an amenable number.

810981 is a deficient number, since it is larger than the sum of its proper divisors (368379).

810981 is a wasteful number, since it uses less digits than its factorization.

810981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616 (or 613 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 810981 is about 900.5448350860. The cubic root of 810981 is about 93.2545920348.

Adding to 810981 its reverse (189018), we get a palindrome (999999).

The spelling of 810981 in words is "eight hundred ten thousand, nine hundred eighty-one".