195645421 has 4 divisors (see below), whose sum is σ = 196097692. Its totient is φ = 195193152.

The previous prime is 195645403. The next prime is 195645479. The reversal of 195645421 is 124546591.

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 104652900 + 90992521 = 10230^2 + 9539^2 .

It is a cyclic number.

It is not a de Polignac number, because 195645421 - 2⁹ = 195644909 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 (195645221) 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, 225486 + ... + 226351.

It is an arithmetic number, because the mean of its divisors is an integer number (49024423).

Almost surely, 2^195645421 is an apocalyptic number.

It is an amenable number.

195645421 is a deficient number, since it is larger than the sum of its proper divisors (452271).

195645421 is an equidigital number, since it uses as much as digits as its factorization.

195645421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452270.

The product of its digits is 43200, while the sum is 37.

The square root of 195645421 is about 13987.3307317729. The cubic root of 195645421 is about 580.5280773152.

The spelling of 195645421 in words is "one hundred ninety-five million, six hundred forty-five thousand, four hundred twenty-one".