195090321 has 8 divisors (see below), whose sum is σ = 263784384. Its totient is φ = 128228240.

The previous prime is 195090289. The next prime is 195090323. The reversal of 195090321 is 123090591.

195090321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 195090321 - 2⁵ = 195090289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195090323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 457746 + ... + 458171.

It is an arithmetic number, because the mean of its divisors is an integer number (32973048).

Almost surely, 2^195090321 is an apocalyptic number.

It is an amenable number.

195090321 is a deficient number, since it is larger than the sum of its proper divisors (68694063).

195090321 is an equidigital number, since it uses as much as digits as its factorization.

195090321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915991.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 195090321 is about 13967.4736799466. The cubic root of 195090321 is about 579.9785178330.

The spelling of 195090321 in words is "one hundred ninety-five million, ninety thousand, three hundred twenty-one".