2161530111 has 48 divisors (see below), whose sum is σ = 3202242336. Its totient is φ = 1295843328.

The previous prime is 2161530103. The next prime is 2161530143. The reversal of 2161530111 is 1110351612.

It is a happy number.

It is not a de Polignac number, because 2161530111 - 2³ = 2161530103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161530011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6905691 + ... + 6906003.

It is an arithmetic number, because the mean of its divisors is an integer number (66713382).

Almost surely, 2^2161530111 is an apocalyptic number.

2161530111 is a deficient number, since it is larger than the sum of its proper divisors (1040712225).

2161530111 is a wasteful number, since it uses less digits than its factorization.

2161530111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 2161530111 is about 46492.2586136660. The cubic root of 2161530111 is about 1292.9659756971.

Adding to 2161530111 its reverse (1110351612), we get a palindrome (3271881723).

The spelling of 2161530111 in words is "two billion, one hundred sixty-one million, five hundred thirty thousand, one hundred eleven".