319890121 has 4 divisors (see below), whose sum is σ = 319942672. Its totient is φ = 319837572.

The previous prime is 319890107. The next prime is 319890157. The reversal of 319890121 is 121098913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 319890121 - 2⁷ = 319889993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (319890421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15735 + ... + 29788.

It is an arithmetic number, because the mean of its divisors is an integer number (79985668).

Almost surely, 2^319890121 is an apocalyptic number.

It is an amenable number.

319890121 is a deficient number, since it is larger than the sum of its proper divisors (52551).

319890121 is an equidigital number, since it uses as much as digits as its factorization.

319890121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52550.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 319890121 is about 17885.4723448949. The cubic root of 319890121 is about 683.9120820221.

The spelling of 319890121 in words is "three hundred nineteen million, eight hundred ninety thousand, one hundred twenty-one".