2161545411 has 4 divisors (see below), whose sum is σ = 2882060552. Its totient is φ = 1441030272.

The previous prime is 2161545409. The next prime is 2161545433. The reversal of 2161545411 is 1145451612.

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

It is not a de Polignac number, because 2161545411 - 2¹ = 2161545409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161541411) 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, 360257566 + ... + 360257571.

It is an arithmetic number, because the mean of its divisors is an integer number (720515138).

Almost surely, 2^2161545411 is an apocalyptic number.

2161545411 is a deficient number, since it is larger than the sum of its proper divisors (720515141).

2161545411 is an equidigital number, since it uses as much as digits as its factorization.

2161545411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720515140.

The product of its digits is 4800, while the sum is 30.

The square root of 2161545411 is about 46492.4231568973. The cubic root of 2161545411 is about 1292.9690263651.

The spelling of 2161545411 in words is "two billion, one hundred sixty-one million, five hundred forty-five thousand, four hundred eleven".