2261115161 has 2 divisors, whose sum is σ = 2261115162. Its totient is φ = 2261115160.

The previous prime is 2261115127. The next prime is 2261115163. The reversal of 2261115161 is 1615111622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1380865600 + 880249561 = 37160^2 + 29669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2261115161 is a prime.

It is a super-2 number, since 2×2261115161² = 10225283542608111842, which contains 22 as substring.

Together with 2261115163, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2261115161.

It is not a weakly prime, because it can be changed into another prime (2261115163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1130557580 + 1130557581.

It is an arithmetic number, because the mean of its divisors is an integer number (1130557581).

Almost surely, 2^2261115161 is an apocalyptic number.

It is an amenable number.

2261115161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2261115161 is an equidigital number, since it uses as much as digits as its factorization.

2261115161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 26.

The square root of 2261115161 is about 47551.1846434976. The cubic root of 2261115161 is about 1312.5249286391.

Adding to 2261115161 its reverse (1615111622), we get a palindrome (3876226783).

The spelling of 2261115161 in words is "two billion, two hundred sixty-one million, one hundred fifteen thousand, one hundred sixty-one".