999028491 has 16 divisors (see below), whose sum is σ = 1364352000. Its totient is φ = 650045088.

The previous prime is 999028487. The next prime is 999028519. The reversal of 999028491 is 194820999.

It is a happy number.

It is not a de Polignac number, because 999028491 - 2² = 999028487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999028691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 891 + ... + 44708.

It is an arithmetic number, because the mean of its divisors is an integer number (85272000).

Almost surely, 2^999028491 is an apocalyptic number.

999028491 is a deficient number, since it is larger than the sum of its proper divisors (365323509).

999028491 is a wasteful number, since it uses less digits than its factorization.

999028491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45778.

The product of its (nonzero) digits is 419904, while the sum is 51.

The square root of 999028491 is about 31607.4119630191. The cubic root of 999028491 is about 999.6760587401.

The spelling of 999028491 in words is "nine hundred ninety-nine million, twenty-eight thousand, four hundred ninety-one".