201115591 has 2 divisors, whose sum is σ = 201115592. Its totient is φ = 201115590.

The previous prime is 201115583. The next prime is 201115613. The reversal of 201115591 is 195511102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201115591 - 2³ = 201115583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201115501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100557795 + 100557796.

It is an arithmetic number, because the mean of its divisors is an integer number (100557796).

Almost surely, 2^201115591 is an apocalyptic number.

201115591 is a deficient number, since it is larger than the sum of its proper divisors (1).

201115591 is an equidigital number, since it uses as much as digits as its factorization.

201115591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 201115591 is about 14181.5228730909. The cubic root of 201115591 is about 585.8888681382. Note that the first 4 decimals are identical.

Adding to 201115591 its reverse (195511102), we get a palindrome (396626693).

The spelling of 201115591 in words is "two hundred one million, one hundred fifteen thousand, five hundred ninety-one".