195545591 has 2 divisors, whose sum is σ = 195545592. Its totient is φ = 195545590.

The previous prime is 195545569. The next prime is 195545599.

It is a happy number.

195545591 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 195545591 - 2¹⁴ = 195529207 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 (195545599) 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, 97772795 + 97772796.

It is an arithmetic number, because the mean of its divisors is an integer number (97772796).

Almost surely, 2^195545591 is an apocalyptic number.

195545591 is a deficient number, since it is larger than the sum of its proper divisors (1).

195545591 is an equidigital number, since it uses as much as digits as its factorization.

195545591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 202500, while the sum is 44.

The square root of 195545591 is about 13983.7616899030. The cubic root of 195545591 is about 580.4293204627.

The spelling of 195545591 in words is "one hundred ninety-five million, five hundred forty-five thousand, five hundred ninety-one".