115122221 has 2 divisors, whose sum is σ = 115122222. Its totient is φ = 115122220.

The previous prime is 115122209. The next prime is 115122229. The reversal of 115122221 is 122221511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75255625 + 39866596 = 8675^2 + 6314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115122221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 115122221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115122229) 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, 57561110 + 57561111.

It is an arithmetic number, because the mean of its divisors is an integer number (57561111).

Almost surely, 2^115122221 is an apocalyptic number.

It is an amenable number.

115122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

115122221 is an equidigital number, since it uses as much as digits as its factorization.

115122221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80, while the sum is 17.

The square root of 115122221 is about 10729.5023649748. The cubic root of 115122221 is about 486.4666286053.

Adding to 115122221 its reverse (122221511), we get a palindrome (237343732).

The spelling of 115122221 in words is "one hundred fifteen million, one hundred twenty-two thousand, two hundred twenty-one".