999553 has 2 divisors, whose sum is σ = 999554. Its totient is φ = 999552.

The previous prime is 999541. The next prime is 999563. The reversal of 999553 is 355999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 976144 + 23409 = 988^2 + 153^2 .

It is a cyclic number.

It is not a de Polignac number, because 999553 - 2⁵ = 999521 is a prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (999563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499776 + 499777.

It is an arithmetic number, because the mean of its divisors is an integer number (499777).

2⁹⁹⁹⁵⁵³ is an apocalyptic number.

It is an amenable number.

999553 is a deficient number, since it is larger than the sum of its proper divisors (1).

999553 is an equidigital number, since it uses as much as digits as its factorization.

999553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54675, while the sum is 40.

The square root of 999553 is about 999.7764750183. The cubic root of 999553 is about 99.9850977793.

The spelling of 999553 in words is "nine hundred ninety-nine thousand, five hundred fifty-three".