2161831651 has 8 divisors (see below), whose sum is σ = 2555860320. Its totient is φ = 1789101888.

The previous prime is 2161831649. The next prime is 2161831667. The reversal of 2161831651 is 1561381612.

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

It is not a de Polignac number, because 2161831651 - 2¹ = 2161831649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2161831621) 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 7 ways as a sum of consecutive naturals, for example, 5324506 + ... + 5324911.

It is an arithmetic number, because the mean of its divisors is an integer number (319482540).

Almost surely, 2^2161831651 is an apocalyptic number.

2161831651 is a deficient number, since it is larger than the sum of its proper divisors (394028669).

2161831651 is a wasteful number, since it uses less digits than its factorization.

2161831651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10649453.

The product of its digits is 8640, while the sum is 34.

The square root of 2161831651 is about 46495.5014060500. The cubic root of 2161831651 is about 1293.0260971252.

The spelling of 2161831651 in words is "two billion, one hundred sixty-one million, eight hundred thirty-one thousand, six hundred fifty-one".