812611121 has 4 divisors (see below), whose sum is σ = 928698432. Its totient is φ = 696523812.

The previous prime is 812611109. The next prime is 812611123. The reversal of 812611121 is 121116218.

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: 121116218 = 2 ⋅60558109.

It is a cyclic number.

It is not a de Polignac number, because 812611121 - 2¹⁴ = 812594737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (812611123) 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, 58043645 + ... + 58043658.

It is an arithmetic number, because the mean of its divisors is an integer number (232174608).

Almost surely, 2^812611121 is an apocalyptic number.

It is an amenable number.

812611121 is a deficient number, since it is larger than the sum of its proper divisors (116087311).

812611121 is a wasteful number, since it uses less digits than its factorization.

812611121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116087310.

The product of its digits is 192, while the sum is 23.

The square root of 812611121 is about 28506.3347521213. The cubic root of 812611121 is about 933.1703267905.

Adding to 812611121 its reverse (121116218), we get a palindrome (933727339).

The spelling of 812611121 in words is "eight hundred twelve million, six hundred eleven thousand, one hundred twenty-one".