990935689 has 2 divisors, whose sum is σ = 990935690. Its totient is φ = 990935688.

The previous prime is 990935681. The next prime is 990935741. The reversal of 990935689 is 986539099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986462464 + 4473225 = 31408^2 + 2115^2 .

It is a cyclic number.

It is not a de Polignac number, because 990935689 - 2³ = 990935681 is a prime.

It is not a weakly prime, because it can be changed into another prime (990935681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495467844 + 495467845.

It is an arithmetic number, because the mean of its divisors is an integer number (495467845).

Almost surely, 2^990935689 is an apocalyptic number.

It is an amenable number.

990935689 is a deficient number, since it is larger than the sum of its proper divisors (1).

990935689 is an equidigital number, since it uses as much as digits as its factorization.

990935689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4723920, while the sum is 58.

The square root of 990935689 is about 31479.1310077010. The cubic root of 990935689 is about 996.9693876672.

The spelling of 990935689 in words is "nine hundred ninety million, nine hundred thirty-five thousand, six hundred eighty-nine".