1999565479 has 2 divisors, whose sum is σ = 1999565480. Its totient is φ = 1999565478.

The previous prime is 1999565461. The next prime is 1999565497. The reversal of 1999565479 is 9745659991.

Together with next prime (1999565497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1999565461) and next prime (1999565497).

It is a cyclic number.

It is not a de Polignac number, because 1999565479 - 2²³ = 1991176871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1999565479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999565429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999782739 + 999782740.

It is an arithmetic number, because the mean of its divisors is an integer number (999782740).

Almost surely, 2^1999565479 is an apocalyptic number.

1999565479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999565479 is an equidigital number, since it uses as much as digits as its factorization.

1999565479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27556200, while the sum is 64.

The square root of 1999565479 is about 44716.5011936310. The cubic root of 1999565479 is about 1259.8297995938.

The spelling of 1999565479 in words is "one billion, nine hundred ninety-nine million, five hundred sixty-five thousand, four hundred seventy-nine".