2115870161 has 4 divisors (see below), whose sum is σ = 2125358592. Its totient is φ = 2106381732.

The previous prime is 2115870137. The next prime is 2115870181. The reversal of 2115870161 is 1610785112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2115870161 - 2¹⁴ = 2115853777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2115870101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4743881 + ... + 4744326.

It is an arithmetic number, because the mean of its divisors is an integer number (531339648).

Almost surely, 2^2115870161 is an apocalyptic number.

It is an amenable number.

2115870161 is a deficient number, since it is larger than the sum of its proper divisors (9488431).

2115870161 is an equidigital number, since it uses as much as digits as its factorization.

2115870161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9488430.

The product of its (nonzero) digits is 3360, while the sum is 32.

The square root of 2115870161 is about 45998.5886848716. The cubic root of 2115870161 is about 1283.7969453474.

It can be divided in two parts, 21158 and 70161, that added together give a palindrome (91319).

The spelling of 2115870161 in words is "two billion, one hundred fifteen million, eight hundred seventy thousand, one hundred sixty-one".