866253121 has 2 divisors, whose sum is σ = 866253122. Its totient is φ = 866253120.

The previous prime is 866253083. The next prime is 866253161. The reversal of 866253121 is 121352668.

866253121 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., 524410000 + 341843121 = 22900^2 + 18489^2 .

It is a cyclic number.

It is not a de Polignac number, because 866253121 - 2⁷ = 866252993 is a prime.

It is not a weakly prime, because it can be changed into another prime (866253161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433126560 + 433126561.

It is an arithmetic number, because the mean of its divisors is an integer number (433126561).

Almost surely, 2^866253121 is an apocalyptic number.

It is an amenable number.

866253121 is a deficient number, since it is larger than the sum of its proper divisors (1).

866253121 is an equidigital number, since it uses as much as digits as its factorization.

866253121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 866253121 is about 29432.1783257713. The cubic root of 866253121 is about 953.2678307509.

The spelling of 866253121 in words is "eight hundred sixty-six million, two hundred fifty-three thousand, one hundred twenty-one".