999000997 has 4 divisors (see below), whose sum is σ = 1000545696. Its totient is φ = 997456300.

The previous prime is 999000991. The next prime is 999001007. The reversal of 999000997 is 799000999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999000997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999000991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771379 + ... + 772672.

It is an arithmetic number, because the mean of its divisors is an integer number (250136424).

Almost surely, 2^999000997 is an apocalyptic number.

It is an amenable number.

999000997 is a deficient number, since it is larger than the sum of its proper divisors (1544699).

999000997 is a wasteful number, since it uses less digits than its factorization.

999000997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544698.

The product of its (nonzero) digits is 413343, while the sum is 52.

The square root of 999000997 is about 31606.9770303963. The cubic root of 999000997 is about 999.6668880487. Note that the first 3 decimals are identical.

The spelling of 999000997 in words is "nine hundred ninety-nine million, nine hundred ninety-seven", and thus it is an aban number.