115521557 has 2 divisors, whose sum is σ = 115521558. Its totient is φ = 115521556.

The previous prime is 115521547. The next prime is 115521583. The reversal of 115521557 is 755125511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110544196 + 4977361 = 10514^2 + 2231^2 .

It is a cyclic number.

It is not a de Polignac number, because 115521557 - 2¹⁰ = 115520533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115521517) 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, 57760778 + 57760779.

It is an arithmetic number, because the mean of its divisors is an integer number (57760779).

Almost surely, 2^115521557 is an apocalyptic number.

It is an amenable number.

115521557 is a deficient number, since it is larger than the sum of its proper divisors (1).

115521557 is an equidigital number, since it uses as much as digits as its factorization.

115521557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8750, while the sum is 32.

The square root of 115521557 is about 10748.0955057163. The cubic root of 115521557 is about 487.0284646760.

The spelling of 115521557 in words is "one hundred fifteen million, five hundred twenty-one thousand, five hundred fifty-seven".