195437491 has 4 divisors (see below), whose sum is σ = 206933832. Its totient is φ = 183941152.

The previous prime is 195437479. The next prime is 195437497. The reversal of 195437491 is 194734591.

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 195437491 - 2¹⁹ = 194913203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195437497) 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, 5748145 + ... + 5748178.

It is an arithmetic number, because the mean of its divisors is an integer number (51733458).

Almost surely, 2^195437491 is an apocalyptic number.

195437491 is a deficient number, since it is larger than the sum of its proper divisors (11496341).

195437491 is a wasteful number, since it uses less digits than its factorization.

195437491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11496340.

The product of its digits is 136080, while the sum is 43.

The square root of 195437491 is about 13979.8959581250. The cubic root of 195437491 is about 580.3223445997.

The spelling of 195437491 in words is "one hundred ninety-five million, four hundred thirty-seven thousand, four hundred ninety-one".