812981 has 8 divisors (see below), whose sum is σ = 913920. Its totient is φ = 717552.

The previous prime is 812969. The next prime is 813013. The reversal of 812981 is 189218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 812981 - 2¹⁰ = 811957 is a prime.

It is a super-2 number, since 2×812981² = 1321876212722, which contains 22 as substring.

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 (812921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1061 + ... + 1658.

It is an arithmetic number, because the mean of its divisors is an integer number (114240).

2⁸¹²⁹⁸¹ is an apocalyptic number.

It is an amenable number.

812981 is a deficient number, since it is larger than the sum of its proper divisors (100939).

812981 is a wasteful number, since it uses less digits than its factorization.

812981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755.

The product of its digits is 1152, while the sum is 29.

The square root of 812981 is about 901.6545901841. The cubic root of 812981 is about 93.3311890097.

The spelling of 812981 in words is "eight hundred twelve thousand, nine hundred eighty-one".