1608720871 has 4 divisors (see below), whose sum is σ = 1609020072. Its totient is φ = 1608421672.

The previous prime is 1608720797. The next prime is 1608720887. The reversal of 1608720871 is 1780278061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1780278061 = 18661 ⋅95401.

It is a cyclic number.

It is not a de Polignac number, because 1608720871 - 2²¹ = 1606623719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1608720271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141385 + ... + 152338.

It is an arithmetic number, because the mean of its divisors is an integer number (402255018).

Almost surely, 2^1608720871 is an apocalyptic number.

1608720871 is a deficient number, since it is larger than the sum of its proper divisors (299201).

1608720871 is an equidigital number, since it uses as much as digits as its factorization.

1608720871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299200.

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 1608720871 is about 40108.8627487741. The cubic root of 1608720871 is about 1171.7282445922.

The spelling of 1608720871 in words is "one billion, six hundred eight million, seven hundred twenty thousand, eight hundred seventy-one".