812081 has 2 divisors, whose sum is σ = 812082. Its totient is φ = 812080.

The previous prime is 812057. The next prime is 812101. The reversal of 812081 is 180218.

It is an a-pointer prime, because the next prime (812101) can be obtained adding 812081 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 781456 + 30625 = 884^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 812081 - 2¹⁸ = 549937 is a prime.

It is a super-2 number, since 2×812081² = 1318951101122, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (812011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406040 + 406041.

It is an arithmetic number, because the mean of its divisors is an integer number (406041).

2⁸¹²⁰⁸¹ is an apocalyptic number.

It is an amenable number.

812081 is a deficient number, since it is larger than the sum of its proper divisors (1).

812081 is an equidigital number, since it uses as much as digits as its factorization.

812081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 812081 is about 901.1553695118. The cubic root of 812081 is about 93.2967359349.

Adding to 812081 its reverse (180218), we get a palindrome (992299).

The spelling of 812081 in words is "eight hundred twelve thousand, eighty-one".