191558113 has 2 divisors, whose sum is σ = 191558114. Its totient is φ = 191558112.

The previous prime is 191558111. The next prime is 191558119. The reversal of 191558113 is 311855191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190771344 + 786769 = 13812^2 + 887^2 .

It is a cyclic number.

It is not a de Polignac number, because 191558113 - 2¹ = 191558111 is a prime.

It is a super-2 number, since 2×191558113² = 73389021312241538, which contains 22 as substring.

Together with 191558111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (191558111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95779056 + 95779057.

It is an arithmetic number, because the mean of its divisors is an integer number (95779057).

Almost surely, 2^191558113 is an apocalyptic number.

It is an amenable number.

191558113 is a deficient number, since it is larger than the sum of its proper divisors (1).

191558113 is an equidigital number, since it uses as much as digits as its factorization.

191558113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 34.

The square root of 191558113 is about 13840.4520518659. The cubic root of 191558113 is about 576.4569108418.

The spelling of 191558113 in words is "one hundred ninety-one million, five hundred fifty-eight thousand, one hundred thirteen".