855429121 has 8 divisors (see below), whose sum is σ = 861160104. Its totient is φ = 849707520.

The previous prime is 855429031. The next prime is 855429163. The reversal of 855429121 is 121924558.

It can be written as a sum of positive squares in 4 ways, for example, as 91680625 + 763748496 = 9575^2 + 27636^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 855429121 - 2²⁵ = 821874689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855429181) 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 in 7 ways as a sum of consecutive naturals, for example, 320625 + ... + 323281.

It is an arithmetic number, because the mean of its divisors is an integer number (107645013).

Almost surely, 2^855429121 is an apocalyptic number.

It is an amenable number.

855429121 is a deficient number, since it is larger than the sum of its proper divisors (5730983).

855429121 is a wasteful number, since it uses less digits than its factorization.

855429121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4691.

The product of its digits is 28800, while the sum is 37.

The square root of 855429121 is about 29247.7199282269. The cubic root of 855429121 is about 949.2807560603.

It can be divided in two parts, 8554 and 29121, that added together give a triangular number (37675 = T₂₇₄).

The spelling of 855429121 in words is "eight hundred fifty-five million, four hundred twenty-nine thousand, one hundred twenty-one".