990505123 has 2 divisors, whose sum is σ = 990505124. Its totient is φ = 990505122.

The previous prime is 990505057. The next prime is 990505163. The reversal of 990505123 is 321505099.

It is a happy number.

990505123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990505123 - 2¹⁷ = 990374051 is a prime.

It is a super-2 number, since 2×990505123² = 1962200797378490258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990505163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495252561 + 495252562.

It is an arithmetic number, because the mean of its divisors is an integer number (495252562).

Almost surely, 2^990505123 is an apocalyptic number.

990505123 is a deficient number, since it is larger than the sum of its proper divisors (1).

990505123 is an equidigital number, since it uses as much as digits as its factorization.

990505123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 990505123 is about 31472.2913528710. The cubic root of 990505123 is about 996.8249708589.

The spelling of 990505123 in words is "nine hundred ninety million, five hundred five thousand, one hundred twenty-three".