855047129 has 2 divisors, whose sum is σ = 855047130. Its totient is φ = 855047128.

The previous prime is 855047071. The next prime is 855047161. The reversal of 855047129 is 921740558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787363600 + 67683529 = 28060^2 + 8227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855047129 is a prime.

It is a super-2 number, since 2×855047129² = 1462211185622285282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855047189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427523564 + 427523565.

It is an arithmetic number, because the mean of its divisors is an integer number (427523565).

Almost surely, 2^855047129 is an apocalyptic number.

It is an amenable number.

855047129 is a deficient number, since it is larger than the sum of its proper divisors (1).

855047129 is an equidigital number, since it uses as much as digits as its factorization.

855047129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 855047129 is about 29241.1889122176. The cubic root of 855047129 is about 949.1394345354.

The spelling of 855047129 in words is "eight hundred fifty-five million, forty-seven thousand, one hundred twenty-nine".