195343591 has 4 divisors (see below), whose sum is σ = 195474384. Its totient is φ = 195212800.

The previous prime is 195343529. The next prime is 195343597.

195343591 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 195343591 - 2⁹ = 195343079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195343597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63130 + ... + 66151.

It is an arithmetic number, because the mean of its divisors is an integer number (48868596).

Almost surely, 2^195343591 is an apocalyptic number.

195343591 is a deficient number, since it is larger than the sum of its proper divisors (130793).

195343591 is a wasteful number, since it uses less digits than its factorization.

195343591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130792.

The product of its digits is 72900, while the sum is 40.

The square root of 195343591 is about 13976.5371605416. The cubic root of 195343591 is about 580.2293890510.

The spelling of 195343591 in words is "one hundred ninety-five million, three hundred forty-three thousand, five hundred ninety-one".