319220921 has 2 divisors, whose sum is σ = 319220922. Its totient is φ = 319220920.

The previous prime is 319220879. The next prime is 319220939. The reversal of 319220921 is 129022913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184660921 + 134560000 = 13589^2 + 11600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-319220921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (319220821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159610460 + 159610461.

It is an arithmetic number, because the mean of its divisors is an integer number (159610461).

Almost surely, 2^319220921 is an apocalyptic number.

It is an amenable number.

319220921 is a deficient number, since it is larger than the sum of its proper divisors (1).

319220921 is an equidigital number, since it uses as much as digits as its factorization.

319220921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 319220921 is about 17866.7546297586. The cubic root of 319220921 is about 683.4348416062.

The spelling of 319220921 in words is "three hundred nineteen million, two hundred twenty thousand, nine hundred twenty-one".