809442155 has 8 divisors (see below), whose sum is σ = 997582992. Its totient is φ = 630052128.

The previous prime is 809442143. The next prime is 809442163. The reversal of 809442155 is 551244908.

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 809442155 - 2¹⁰ = 809441131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2187497 + ... + 2187866.

It is an arithmetic number, because the mean of its divisors is an integer number (124697874).

Almost surely, 2^809442155 is an apocalyptic number.

809442155 is a deficient number, since it is larger than the sum of its proper divisors (188140837).

809442155 is a wasteful number, since it uses less digits than its factorization.

809442155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375405.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 809442155 is about 28450.6969158929. The cubic root of 809442155 is about 931.9557083061.

The spelling of 809442155 in words is "eight hundred nine million, four hundred forty-two thousand, one hundred fifty-five".