195242591 has 2 divisors, whose sum is σ = 195242592. Its totient is φ = 195242590.

The previous prime is 195242543. The next prime is 195242629.

195242591 is nontrivially palindromic in base 10.

It is an a-pointer prime, because the next prime (195242629) can be obtained adding 195242591 to its sum of digits (38).

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 195242591 - 2¹⁰ = 195241567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195242291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97621295 + 97621296.

It is an arithmetic number, because the mean of its divisors is an integer number (97621296).

Almost surely, 2^195242591 is an apocalyptic number.

195242591 is a deficient number, since it is larger than the sum of its proper divisors (1).

195242591 is an equidigital number, since it uses as much as digits as its factorization.

195242591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 38.

The square root of 195242591 is about 13972.9234951029. The cubic root of 195242591 is about 580.1293716562.

It can be divided in two parts, 1952425 and 91, that multiplied together give a triangular number (177670675 = T₁₈₈₅₀).

The spelling of 195242591 in words is "one hundred ninety-five million, two hundred forty-two thousand, five hundred ninety-one".