811752197 has 2 divisors, whose sum is σ = 811752198. Its totient is φ = 811752196.

The previous prime is 811752173. The next prime is 811752209. The reversal of 811752197 is 791257118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 743871076 + 67881121 = 27274^2 + 8239^2 .

It is a cyclic number.

It is not a de Polignac number, because 811752197 - 2¹⁶ = 811686661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811752107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405876098 + 405876099.

It is an arithmetic number, because the mean of its divisors is an integer number (405876099).

Almost surely, 2^811752197 is an apocalyptic number.

It is an amenable number.

811752197 is a deficient number, since it is larger than the sum of its proper divisors (1).

811752197 is an equidigital number, since it uses as much as digits as its factorization.

811752197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 41.

The square root of 811752197 is about 28491.2652755191. The cubic root of 811752197 is about 932.8414261491.

The spelling of 811752197 in words is "eight hundred eleven million, seven hundred fifty-two thousand, one hundred ninety-seven".