811291097 has 2 divisors, whose sum is σ = 811291098. Its totient is φ = 811291096.

The previous prime is 811291093. The next prime is 811291147. The reversal of 811291097 is 790192118.

811291097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 617969881 + 193321216 = 24859^2 + 13904^2 .

It is a cyclic number.

It is not a de Polignac number, because 811291097 - 2² = 811291093 is a prime.

It is a Chen prime.

It is equal to p_41697227 and since 811291097 and 41697227 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 811291097.

It is not a weakly prime, because it can be changed into another prime (811291093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405645548 + 405645549.

It is an arithmetic number, because the mean of its divisors is an integer number (405645549).

Almost surely, 2^811291097 is an apocalyptic number.

It is an amenable number.

811291097 is a deficient number, since it is larger than the sum of its proper divisors (1).

811291097 is an equidigital number, since it uses as much as digits as its factorization.

811291097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 811291097 is about 28483.1721723547. The cubic root of 811291097 is about 932.6647652371.

The spelling of 811291097 in words is "eight hundred eleven million, two hundred ninety-one thousand, ninety-seven".