811712249 has 2 divisors, whose sum is σ = 811712250. Its totient is φ = 811712248.

The previous prime is 811712191. The next prime is 811712309. The reversal of 811712249 is 942217118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 742290025 + 69422224 = 27245^2 + 8332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811712249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (811712449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405856124 + 405856125.

It is an arithmetic number, because the mean of its divisors is an integer number (405856125).

Almost surely, 2^811712249 is an apocalyptic number.

It is an amenable number.

811712249 is a deficient number, since it is larger than the sum of its proper divisors (1).

811712249 is an equidigital number, since it uses as much as digits as its factorization.

811712249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 811712249 is about 28490.5642099275. The cubic root of 811712249 is about 932.8261235478.

The spelling of 811712249 in words is "eight hundred eleven million, seven hundred twelve thousand, two hundred forty-nine".