2661231117 has 4 divisors (see below), whose sum is σ = 3548308160. Its totient is φ = 1774154076.

The previous prime is 2661231109. The next prime is 2661231121. The reversal of 2661231117 is 7111321662.

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 not a de Polignac number, because 2661231117 - 2³ = 2661231109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661231317) 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 3 ways as a sum of consecutive naturals, for example, 443538517 + ... + 443538522.

It is an arithmetic number, because the mean of its divisors is an integer number (887077040).

Almost surely, 2^2661231117 is an apocalyptic number.

It is an amenable number.

2661231117 is a deficient number, since it is larger than the sum of its proper divisors (887077043).

2661231117 is an equidigital number, since it uses as much as digits as its factorization.

2661231117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887077042.

The product of its digits is 3024, while the sum is 30.

The square root of 2661231117 is about 51587.1216196446. The cubic root of 2661231117 is about 1385.7797078926.

Adding to 2661231117 its reverse (7111321662), we get a palindrome (9772552779).

The spelling of 2661231117 in words is "two billion, six hundred sixty-one million, two hundred thirty-one thousand, one hundred seventeen".