115821571 has 2 divisors, whose sum is σ = 115821572. Its totient is φ = 115821570.

The previous prime is 115821533. The next prime is 115821577. The reversal of 115821571 is 175128511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 115821571 - 2¹⁹ = 115297283 is a prime.

It is not a weakly prime, because it can be changed into another prime (115821577) 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, 57910785 + 57910786.

It is an arithmetic number, because the mean of its divisors is an integer number (57910786).

Almost surely, 2^115821571 is an apocalyptic number.

115821571 is a deficient number, since it is larger than the sum of its proper divisors (1).

115821571 is an equidigital number, since it uses as much as digits as its factorization.

115821571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 31.

The square root of 115821571 is about 10762.0430681168. The cubic root of 115821571 is about 487.4497108765.

The spelling of 115821571 in words is "one hundred fifteen million, eight hundred twenty-one thousand, five hundred seventy-one".