990695321 has 16 divisors (see below), whose sum is σ = 1300162560. Its totient is φ = 731339280.

The previous prime is 990695317. The next prime is 990695333. The reversal of 990695321 is 123596099.

It is not a de Polignac number, because 990695321 - 2² = 990695317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990695311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337121 + ... + 340046.

It is an arithmetic number, because the mean of its divisors is an integer number (81260160).

Almost surely, 2^990695321 is an apocalyptic number.

It is an amenable number.

990695321 is a deficient number, since it is larger than the sum of its proper divisors (309467239).

990695321 is a wasteful number, since it uses less digits than its factorization.

990695321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677204.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 990695321 is about 31475.3128816855. The cubic root of 990695321 is about 996.8887706237. Note that the first 3 decimals are identical.

The spelling of 990695321 in words is "nine hundred ninety million, six hundred ninety-five thousand, three hundred twenty-one".