2161543412 has 12 divisors (see below), whose sum is σ = 4323086880. Its totient is φ = 926375736.

The previous prime is 2161543403. The next prime is 2161543457. The reversal of 2161543412 is 2143451612.

2161543412 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38598962 + ... + 38599017.

It is an arithmetic number, because the mean of its divisors is an integer number (360257240).

Almost surely, 2^2161543412 is an apocalyptic number.

It is an amenable number.

2161543412 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161543412 is a wasteful number, since it uses less digits than its factorization.

2161543412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77197990 (or 77197988 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 2161543412 is about 46492.4016587657. The cubic root of 2161543412 is about 1292.9686277852.

The spelling of 2161543412 in words is "two billion, one hundred sixty-one million, five hundred forty-three thousand, four hundred twelve".