811157 has 2 divisors, whose sum is σ = 811158. Its totient is φ = 811156.

The previous prime is 811147. The next prime is 811163. The reversal of 811157 is 751118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 682276 + 128881 = 826^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 811157 - 2¹⁶ = 745621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405578 + 405579.

It is an arithmetic number, because the mean of its divisors is an integer number (405579).

2⁸¹¹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

811157 is a deficient number, since it is larger than the sum of its proper divisors (1).

811157 is an equidigital number, since it uses as much as digits as its factorization.

811157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280, while the sum is 23.

The square root of 811157 is about 900.6425484064. The cubic root of 811157 is about 93.2613376186.

The spelling of 811157 in words is "eight hundred eleven thousand, one hundred fifty-seven".