999963539 has 2 divisors, whose sum is σ = 999963540. Its totient is φ = 999963538.

The previous prime is 999963487. The next prime is 999963541. The reversal of 999963539 is 935369999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999963539 - 2²⁰ = 998914963 is a prime.

It is a Sophie Germain prime.

Together with 999963541, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999963599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499981769 + 499981770.

It is an arithmetic number, because the mean of its divisors is an integer number (499981770).

Almost surely, 2^999963539 is an apocalyptic number.

999963539 is a deficient number, since it is larger than the sum of its proper divisors (1).

999963539 is an equidigital number, since it uses as much as digits as its factorization.

999963539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15943230, while the sum is 62.

The square root of 999963539 is about 31622.2000973999. The cubic root of 999963539 is about 999.9878461856.

The spelling of 999963539 in words is "nine hundred ninety-nine million, nine hundred sixty-three thousand, five hundred thirty-nine".