2511872161 has 4 divisors (see below), whose sum is σ = 2512092292. Its totient is φ = 2511652032.

The previous prime is 2511872147. The next prime is 2511872177. The reversal of 2511872161 is 1612781152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1373147136 + 1138725025 = 37056^2 + 33745^2 .

It is a cyclic number.

It is not a de Polignac number, because 2511872161 - 2¹⁹ = 2511347873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2511872261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91956 + ... + 116101.

It is an arithmetic number, because the mean of its divisors is an integer number (628023073).

Almost surely, 2^2511872161 is an apocalyptic number.

It is an amenable number.

2511872161 is a deficient number, since it is larger than the sum of its proper divisors (220131).

2511872161 is a wasteful number, since it uses less digits than its factorization.

2511872161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220130.

The product of its digits is 6720, while the sum is 34.

The square root of 2511872161 is about 50118.5809954751. The cubic root of 2511872161 is about 1359.3538166187.

It can be divided in two parts, 25118 and 72161, that added together give a palindrome (97279).

The spelling of 2511872161 in words is "two billion, five hundred eleven million, eight hundred seventy-two thousand, one hundred sixty-one".