319499987 has 2 divisors, whose sum is σ = 319499988. Its totient is φ = 319499986.

The previous prime is 319499911. The next prime is 319500001. The reversal of 319499987 is 789994913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 319499987 - 2¹⁸ = 319237843 is a prime.

It is not a weakly prime, because it can be changed into another prime (319499387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159749993 + 159749994.

It is an arithmetic number, because the mean of its divisors is an integer number (159749994).

Almost surely, 2^319499987 is an apocalyptic number.

319499987 is a deficient number, since it is larger than the sum of its proper divisors (1).

319499987 is an equidigital number, since it uses as much as digits as its factorization.

319499987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 59.

The square root of 319499987 is about 17874.5625680742. The cubic root of 319499987 is about 683.6339387043.

The spelling of 319499987 in words is "three hundred nineteen million, four hundred ninety-nine thousand, nine hundred eighty-seven".