990751 has 4 divisors (see below), whose sum is σ = 995104. Its totient is φ = 986400.

The previous prime is 990733. The next prime is 990761. The reversal of 990751 is 157099.

990751 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157099 = 127 ⋅1237.

It is a cyclic number.

It is not a de Polignac number, because 990751 - 2⁵ = 990719 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990761) 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, 1815 + ... + 2296.

It is an arithmetic number, because the mean of its divisors is an integer number (248776).

2⁹⁹⁰⁷⁵¹ is an apocalyptic number.

990751 is a deficient number, since it is larger than the sum of its proper divisors (4353).

990751 is a wasteful number, since it uses less digits than its factorization.

990751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4352.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 990751 is about 995.3647572624. The cubic root of 990751 is about 99.6907445969.

The spelling of 990751 in words is "nine hundred ninety thousand, seven hundred fifty-one".