866293121 has 2 divisors, whose sum is σ = 866293122. Its totient is φ = 866293120.

The previous prime is 866293097. The next prime is 866293177. The reversal of 866293121 is 121392668.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 557904400 + 308388721 = 23620^2 + 17561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866293121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (866290121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433146560 + 433146561.

It is an arithmetic number, because the mean of its divisors is an integer number (433146561).

Almost surely, 2^866293121 is an apocalyptic number.

It is an amenable number.

866293121 is a deficient number, since it is larger than the sum of its proper divisors (1).

866293121 is an equidigital number, since it uses as much as digits as its factorization.

866293121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 866293121 is about 29432.8578462914. The cubic root of 866293121 is about 953.2825031853.

The spelling of 866293121 in words is "eight hundred sixty-six million, two hundred ninety-three thousand, one hundred twenty-one".