990511 has 2 divisors, whose sum is σ = 990512. Its totient is φ = 990510.

The previous prime is 990503. The next prime is 990523. The reversal of 990511 is 115099.

It is a weak prime.

It is an emirp because it is prime and its reverse (115099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990511 - 2³ = 990503 is a prime.

It is a super-2 number, since 2×990511² = 1962224082242, which contains 22 as substring.

990511 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990211) 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 as a sum of consecutive naturals, namely, 495255 + 495256.

It is an arithmetic number, because the mean of its divisors is an integer number (495256).

2⁹⁹⁰⁵¹¹ is an apocalyptic number.

990511 is a deficient number, since it is larger than the sum of its proper divisors (1).

990511 is an equidigital number, since it uses as much as digits as its factorization.

990511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 990511 is about 995.2441911410. The cubic root of 990511 is about 99.6826942354.

The spelling of 990511 in words is "nine hundred ninety thousand, five hundred eleven".