195023391 has 12 divisors (see below), whose sum is σ = 274438872. Its totient is φ = 123171984.

The previous prime is 195023377. The next prime is 195023401. The reversal of 195023391 is 193320591.

It is not a de Polignac number, because 195023391 - 2⁹ = 195022879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195023321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88956 + ... + 91121.

It is an arithmetic number, because the mean of its divisors is an integer number (22869906).

Almost surely, 2^195023391 is an apocalyptic number.

195023391 is a deficient number, since it is larger than the sum of its proper divisors (79415481).

195023391 is a wasteful number, since it uses less digits than its factorization.

195023391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180118 (or 180099 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 195023391 is about 13965.0775508051. The cubic root of 195023391 is about 579.9121854765.

The spelling of 195023391 in words is "one hundred ninety-five million, twenty-three thousand, three hundred ninety-one".