2161385528 has 8 divisors (see below), whose sum is σ = 4052597880. Its totient is φ = 1080692760.

The previous prime is 2161385521. The next prime is 2161385531. The reversal of 2161385528 is 8255831612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161385521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135086588 + ... + 135086603.

It is an arithmetic number, because the mean of its divisors is an integer number (506574735).

Almost surely, 2^2161385528 is an apocalyptic number.

It is an amenable number.

2161385528 is a deficient number, since it is larger than the sum of its proper divisors (1891212352).

2161385528 is a wasteful number, since it uses less digits than its factorization.

2161385528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270173197 (or 270173193 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 2161385528 is about 46490.7036728850. The cubic root of 2161385528 is about 1292.9371465717.

The spelling of 2161385528 in words is "two billion, one hundred sixty-one million, three hundred eighty-five thousand, five hundred twenty-eight".