866112139 has 2 divisors, whose sum is σ = 866112140. Its totient is φ = 866112138.

The previous prime is 866112113. The next prime is 866112157. The reversal of 866112139 is 931211668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866112139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866112098 and 866112107.

It is not a weakly prime, because it can be changed into another prime (866112199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433056069 + 433056070.

It is an arithmetic number, because the mean of its divisors is an integer number (433056070).

Almost surely, 2^866112139 is an apocalyptic number.

866112139 is a deficient number, since it is larger than the sum of its proper divisors (1).

866112139 is an equidigital number, since it uses as much as digits as its factorization.

866112139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 866112139 is about 29429.7831966190. The cubic root of 866112139 is about 953.2161134204.

The spelling of 866112139 in words is "eight hundred sixty-six million, one hundred twelve thousand, one hundred thirty-nine".