115221289 has 2 divisors, whose sum is σ = 115221290. Its totient is φ = 115221288.

The previous prime is 115221251. The next prime is 115221313. The reversal of 115221289 is 982122511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83411689 + 31809600 = 9133^2 + 5640^2 .

It is a cyclic number.

It is not a de Polignac number, because 115221289 - 2¹¹ = 115219241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 115221289.

It is not a weakly prime, because it can be changed into another prime (115221989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57610644 + 57610645.

It is an arithmetic number, because the mean of its divisors is an integer number (57610645).

Almost surely, 2^115221289 is an apocalyptic number.

It is an amenable number.

115221289 is a deficient number, since it is larger than the sum of its proper divisors (1).

115221289 is an equidigital number, since it uses as much as digits as its factorization.

115221289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 31.

The square root of 115221289 is about 10734.1179889174. The cubic root of 115221289 is about 486.6061309475.

The spelling of 115221289 in words is "one hundred fifteen million, two hundred twenty-one thousand, two hundred eighty-nine".