990577331 has 8 divisors (see below), whose sum is σ = 1078669200. Its totient is φ = 906081120.

The previous prime is 990577327. The next prime is 990577351. The reversal of 990577331 is 133775099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 990577331 - 2² = 990577327 is a prime.

It is a super-2 number, since 2×990577331² = 1962486897382167122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990577351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 898340 + ... + 899441.

It is an arithmetic number, because the mean of its divisors is an integer number (134833650).

Almost surely, 2^990577331 is an apocalyptic number.

990577331 is a deficient number, since it is larger than the sum of its proper divisors (88091869).

990577331 is a wasteful number, since it uses less digits than its factorization.

990577331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797829.

The product of its (nonzero) digits is 178605, while the sum is 44.

The square root of 990577331 is about 31473.4384997890. The cubic root of 990577331 is about 996.8491931763.

The spelling of 990577331 in words is "nine hundred ninety million, five hundred seventy-seven thousand, three hundred thirty-one".