990261 has 12 divisors (see below), whose sum is σ = 1505920. Its totient is φ = 625320.

The previous prime is 990259. The next prime is 990277. The reversal of 990261 is 162099.

It is a happy number.

It is not a de Polignac number, because 990261 - 2¹ = 990259 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990261.

It is not an unprimeable number, because it can be changed into a prime (990211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2725 + ... + 3066.

2⁹⁹⁰²⁶¹ is an apocalyptic number.

It is an amenable number.

990261 is a deficient number, since it is larger than the sum of its proper divisors (515659).

990261 is a wasteful number, since it uses less digits than its factorization.

990261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5816 (or 5813 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 990261 is about 995.1185858982. The cubic root of 990261 is about 99.6743070594.

The spelling of 990261 in words is "nine hundred ninety thousand, two hundred sixty-one".