990000651 has 4 divisors (see below), whose sum is σ = 1320000872. Its totient is φ = 660000432.

The previous prime is 990000647. The next prime is 990000679. The reversal of 990000651 is 156000099.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 990000651 - 2² = 990000647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990000251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165000106 + ... + 165000111.

It is an arithmetic number, because the mean of its divisors is an integer number (330000218).

Almost surely, 2^990000651 is an apocalyptic number.

990000651 is a deficient number, since it is larger than the sum of its proper divisors (330000221).

990000651 is a wasteful number, since it uses less digits than its factorization.

990000651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330000220.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 990000651 is about 31464.2757901719. The cubic root of 990000651 is about 996.6557118714.

The spelling of 990000651 in words is "nine hundred ninety million, six hundred fifty-one", and thus it is an aban number.