999991283 has 2 divisors, whose sum is σ = 999991284. Its totient is φ = 999991282.

The previous prime is 999991277. The next prime is 999991301. The reversal of 999991283 is 382199999.

It is a weak prime.

It is an emirp because it is prime and its reverse (382199999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999991283 - 2¹⁰ = 999990259 is a prime.

It is not a weakly prime, because it can be changed into another prime (999291283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499995641 + 499995642.

It is an arithmetic number, because the mean of its divisors is an integer number (499995642).

Almost surely, 2^999991283 is an apocalyptic number.

999991283 is a deficient number, since it is larger than the sum of its proper divisors (1).

999991283 is an equidigital number, since it uses as much as digits as its factorization.

999991283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 59.

The square root of 999991283 is about 31622.6387735116. The cubic root of 999991283 is about 999.9970943249.

The spelling of 999991283 in words is "nine hundred ninety-nine million, nine hundred ninety-one thousand, two hundred eighty-three".