2161542511 has 8 divisors (see below), whose sum is σ = 2196352944. Its totient is φ = 2126995200.

The previous prime is 2161542497. The next prime is 2161542517. The reversal of 2161542511 is 1152451612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161542511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161542511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161542517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49186 + ... + 82111.

It is an arithmetic number, because the mean of its divisors is an integer number (274544118).

Almost surely, 2^2161542511 is an apocalyptic number.

2161542511 is a deficient number, since it is larger than the sum of its proper divisors (34810433).

2161542511 is a wasteful number, since it uses less digits than its factorization.

2161542511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131561.

The product of its digits is 2400, while the sum is 28.

The square root of 2161542511 is about 46492.3919690093. The cubic root of 2161542511 is about 1292.9684481351.

The spelling of 2161542511 in words is "two billion, one hundred sixty-one million, five hundred forty-two thousand, five hundred eleven".