999055 has 4 divisors (see below), whose sum is σ = 1198872. Its totient is φ = 799240.

The previous prime is 999049. The next prime is 999067. The reversal of 999055 is 550999.

999055 = 445² + 446² + ... + 449².

It is a happy number.

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

It is not a de Polignac number, because 999055 - 2⁵ = 999023 is a prime.

It is a super-2 number, since 2×999055² = 1996221786050, which contains 22 as substring.

It is a Duffinian number.

999055 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99901 + ... + 99910.

It is an arithmetic number, because the mean of its divisors is an integer number (299718).

2⁹⁹⁹⁰⁵⁵ is an apocalyptic number.

999055 is a deficient number, since it is larger than the sum of its proper divisors (199817).

999055 is a wasteful number, since it uses less digits than its factorization.

999055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199816.

The product of its (nonzero) digits is 18225, while the sum is 37.

The square root of 999055 is about 999.5273883191. The cubic root of 999055 is about 99.9684900723.

The spelling of 999055 in words is "nine hundred ninety-nine thousand, fifty-five".