990042571 has 16 divisors (see below), whose sum is σ = 1186545600. Its totient is φ = 808109568.

The previous prime is 990042563. The next prime is 990042589. The reversal of 990042571 is 175240099.

It is not a de Polignac number, because 990042571 - 2³ = 990042563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990042571.

It is not an unprimeable number, because it can be changed into a prime (990042511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18586 + ... + 48223.

It is an arithmetic number, because the mean of its divisors is an integer number (74159100).

Almost surely, 2^990042571 is an apocalyptic number.

990042571 is a deficient number, since it is larger than the sum of its proper divisors (196503029).

990042571 is a wasteful number, since it uses less digits than its factorization.

990042571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66918.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 990042571 is about 31464.9419354303. The cubic root of 990042571 is about 996.6697789388.

The spelling of 990042571 in words is "nine hundred ninety million, forty-two thousand, five hundred seventy-one".