319487989 has 2 divisors, whose sum is σ = 319487990. Its totient is φ = 319487988.

The previous prime is 319487977. The next prime is 319488011. The reversal of 319487989 is 989784913.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223741764 + 95746225 = 14958^2 + 9785^2 .

It is a cyclic number.

It is not a de Polignac number, because 319487989 - 2¹¹ = 319485941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319487689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159743994 + 159743995.

It is an arithmetic number, because the mean of its divisors is an integer number (159743995).

Almost surely, 2^319487989 is an apocalyptic number.

It is an amenable number.

319487989 is a deficient number, since it is larger than the sum of its proper divisors (1).

319487989 is an equidigital number, since it uses as much as digits as its factorization.

319487989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 58.

The square root of 319487989 is about 17874.2269483186. The cubic root of 319487989 is about 683.6253812259.

The spelling of 319487989 in words is "three hundred nineteen million, four hundred eighty-seven thousand, nine hundred eighty-nine".