999997999487 has 2 divisors, whose sum is σ = 999997999488. Its totient is φ = 999997999486.

The previous prime is 999997999477. The next prime is 999997999489. The reversal of 999997999487 is 784999799999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999997999487 - 2²² = 999993805183 is a prime.

Together with 999997999489, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 999997999393 and 999997999402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999997999489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998999743 + 499998999744.

It is an arithmetic number, because the mean of its divisors is an integer number (499998999744).

Almost surely, 2^999997999487 is an apocalyptic number.

999997999487 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997999487 is an equidigital number, since it uses as much as digits as its factorization.

999997999487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67497258528, while the sum is 98.

The spelling of 999997999487 in words is "nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, four hundred eighty-seven".