115440161 has 2 divisors, whose sum is σ = 115440162. Its totient is φ = 115440160.

The previous prime is 115440119. The next prime is 115440163. The reversal of 115440161 is 161044511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111175936 + 4264225 = 10544^2 + 2065^2 .

It is a cyclic number.

It is not a de Polignac number, because 115440161 - 2¹⁸ = 115178017 is a prime.

Together with 115440163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (115440163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57720080 + 57720081.

It is an arithmetic number, because the mean of its divisors is an integer number (57720081).

Almost surely, 2^115440161 is an apocalyptic number.

It is an amenable number.

115440161 is a deficient number, since it is larger than the sum of its proper divisors (1).

115440161 is an equidigital number, since it uses as much as digits as its factorization.

115440161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 115440161 is about 10744.3083071922. The cubic root of 115440161 is about 486.9140517354.

Adding to 115440161 its reverse (161044511), we get a palindrome (276484672).

The spelling of 115440161 in words is "one hundred fifteen million, four hundred forty thousand, one hundred sixty-one".