1609791855 has 24 divisors (see below), whose sum is σ = 2996185392. Its totient is φ = 735904512.

The previous prime is 1609791851. The next prime is 1609791857. The reversal of 1609791855 is 5581979061.

It is not a de Polignac number, because 1609791855 - 2² = 1609791851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1609791798 and 1609791807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609791851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1094362 + ... + 1095831.

It is an arithmetic number, because the mean of its divisors is an integer number (124841058).

Almost surely, 2^1609791855 is an apocalyptic number.

1609791855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1609791855 is a deficient number, since it is larger than the sum of its proper divisors (1386393537).

1609791855 is a wasteful number, since it uses less digits than its factorization.

1609791855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190215 (or 2190208 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 51.

The square root of 1609791855 is about 40122.2114918906. The cubic root of 1609791855 is about 1171.9882076162.

The spelling of 1609791855 in words is "one billion, six hundred nine million, seven hundred ninety-one thousand, eight hundred fifty-five".