865911157 has 2 divisors, whose sum is σ = 865911158. Its totient is φ = 865911156.

The previous prime is 865911097. The next prime is 865911197. The reversal of 865911157 is 751119568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 759222916 + 106688241 = 27554^2 + 10329^2 .

It is a cyclic number.

It is not a de Polignac number, because 865911157 - 2¹⁵ = 865878389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865911197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432955578 + 432955579.

It is an arithmetic number, because the mean of its divisors is an integer number (432955579).

Almost surely, 2^865911157 is an apocalyptic number.

It is an amenable number.

865911157 is a deficient number, since it is larger than the sum of its proper divisors (1).

865911157 is an equidigital number, since it uses as much as digits as its factorization.

865911157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 43.

The square root of 865911157 is about 29426.3683963890. The cubic root of 865911157 is about 953.1423762014.

The spelling of 865911157 in words is "eight hundred sixty-five million, nine hundred eleven thousand, one hundred fifty-seven".