195457321 has 4 divisors (see below), whose sum is σ = 197392644. Its totient is φ = 193522000.

The previous prime is 195457309. The next prime is 195457357. The reversal of 195457321 is 123754591.

195457321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 96255721 + 99201600 = 9811^2 + 9960^2 .

It is a cyclic number.

It is not a de Polignac number, because 195457321 - 2⁷ = 195457193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195457121) 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, 967510 + ... + 967711.

It is an arithmetic number, because the mean of its divisors is an integer number (49348161).

Almost surely, 2^195457321 is an apocalyptic number.

It is an amenable number.

195457321 is a deficient number, since it is larger than the sum of its proper divisors (1935323).

195457321 is a wasteful number, since it uses less digits than its factorization.

195457321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935322.

The product of its digits is 37800, while the sum is 37.

The square root of 195457321 is about 13980.6051728815. The cubic root of 195457321 is about 580.3419713404.

The spelling of 195457321 in words is "one hundred ninety-five million, four hundred fifty-seven thousand, three hundred twenty-one".