115405261 has 2 divisors, whose sum is σ = 115405262. Its totient is φ = 115405260.

The previous prime is 115405253. The next prime is 115405309. The reversal of 115405261 is 162504511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79477225 + 35928036 = 8915^2 + 5994^2 .

It is a cyclic number.

It is not a de Polignac number, because 115405261 - 2³ = 115405253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115405561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57702630 + 57702631.

It is an arithmetic number, because the mean of its divisors is an integer number (57702631).

Almost surely, 2^115405261 is an apocalyptic number.

It is an amenable number.

115405261 is a deficient number, since it is larger than the sum of its proper divisors (1).

115405261 is an equidigital number, since it uses as much as digits as its factorization.

115405261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 115405261 is about 10742.6840687046. The cubic root of 115405261 is about 486.8649786542.

Adding to 115405261 its reverse (162504511), we get a palindrome (277909772).

The spelling of 115405261 in words is "one hundred fifteen million, four hundred five thousand, two hundred sixty-one".