809106139 has 2 divisors, whose sum is σ = 809106140. Its totient is φ = 809106138.

The previous prime is 809106101. The next prime is 809106157. The reversal of 809106139 is 931601908.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809106139 - 2¹¹ = 809104091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 809106098 and 809106107.

It is not a weakly prime, because it can be changed into another prime (809106839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404553069 + 404553070.

It is an arithmetic number, because the mean of its divisors is an integer number (404553070).

Almost surely, 2^809106139 is an apocalyptic number.

809106139 is a deficient number, since it is larger than the sum of its proper divisors (1).

809106139 is an equidigital number, since it uses as much as digits as its factorization.

809106139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 809106139 is about 28444.7910697196. The cubic root of 809106139 is about 931.8267324967.

The spelling of 809106139 in words is "eight hundred nine million, one hundred six thousand, one hundred thirty-nine".