2161189512 has 48 divisors (see below), whose sum is σ = 6070013040. Its totient is φ = 720395856.

The previous prime is 2161189493. The next prime is 2161189517. The reversal of 2161189512 is 2159811612.

2161189512 is a `hidden beast` number, since 2 + 1 + 61 + 1 + 89 + 512 = 666.

It is a super-3 number, since 3×2161189512³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2161189517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553918 + ... + 557805.

It is an arithmetic number, because the mean of its divisors is an integer number (126458605).

Almost surely, 2^2161189512 is an apocalyptic number.

It is an amenable number.

2161189512 is an abundant number, since it is smaller than the sum of its proper divisors (3908823528).

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

2161189512 is a wasteful number, since it uses less digits than its factorization.

2161189512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111744 (or 1111728 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 2161189512 is about 46488.5955047042. The cubic root of 2161189512 is about 1292.8980599108.

The spelling of 2161189512 in words is "two billion, one hundred sixty-one million, one hundred eighty-nine thousand, five hundred twelve".