990871529 has 2 divisors, whose sum is σ = 990871530. Its totient is φ = 990871528.

The previous prime is 990871499. The next prime is 990871561. The reversal of 990871529 is 925178099.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777127129 + 213744400 = 27877^2 + 14620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990871529 is a prime.

It is not a weakly prime, because it can be changed into another prime (990871829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495435764 + 495435765.

It is an arithmetic number, because the mean of its divisors is an integer number (495435765).

Almost surely, 2^990871529 is an apocalyptic number.

It is an amenable number.

990871529 is a deficient number, since it is larger than the sum of its proper divisors (1).

990871529 is an equidigital number, since it uses as much as digits as its factorization.

990871529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 990871529 is about 31478.1119033528. Note that the first 3 decimals coincide. The cubic root of 990871529 is about 996.9478703151.

The spelling of 990871529 in words is "nine hundred ninety million, eight hundred seventy-one thousand, five hundred twenty-nine".