2161067851 has 4 divisors (see below), whose sum is σ = 2165946552. Its totient is φ = 2156189152.

The previous prime is 2161067819. The next prime is 2161067861. The reversal of 2161067851 is 1587601612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161067851 - 2⁵ = 2161067819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161067851.

It is not an unprimeable number, because it can be changed into a prime (2161067861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2438686 + ... + 2439571.

It is an arithmetic number, because the mean of its divisors is an integer number (541486638).

Almost surely, 2^2161067851 is an apocalyptic number.

2161067851 is a deficient number, since it is larger than the sum of its proper divisors (4878701).

2161067851 is an equidigital number, since it uses as much as digits as its factorization.

2161067851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4878700.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 2161067851 is about 46487.2869825719. The cubic root of 2161067851 is about 1292.8737988543.

The spelling of 2161067851 in words is "two billion, one hundred sixty-one million, sixty-seven thousand, eight hundred fifty-one".