990788571 has 8 divisors (see below), whose sum is σ = 1467834960. Its totient is φ = 660525696.

The previous prime is 990788569. The next prime is 990788587. The reversal of 990788571 is 175887099.

It is not a de Polignac number, because 990788571 - 2¹ = 990788569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990788531) 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 7 ways as a sum of consecutive naturals, for example, 18347910 + ... + 18347963.

It is an arithmetic number, because the mean of its divisors is an integer number (183479370).

Almost surely, 2^990788571 is an apocalyptic number.

990788571 is a deficient number, since it is larger than the sum of its proper divisors (477046389).

990788571 is a wasteful number, since it uses less digits than its factorization.

990788571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36695882 (or 36695876 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 54.

The square root of 990788571 is about 31476.7941664967. The cubic root of 990788571 is about 996.9200472969.

The spelling of 990788571 in words is "nine hundred ninety million, seven hundred eighty-eight thousand, five hundred seventy-one".