990217829 has 2 divisors, whose sum is σ = 990217830. Its totient is φ = 990217828.

The previous prime is 990217799. The next prime is 990217859. The reversal of 990217829 is 928712099.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (990217799) and next prime (990217859).

It can be written as a sum of positive squares in only one way, i.e., 718132804 + 272085025 = 26798^2 + 16495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990217829 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990217859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495108914 + 495108915.

It is an arithmetic number, because the mean of its divisors is an integer number (495108915).

Almost surely, 2^990217829 is an apocalyptic number.

It is an amenable number.

990217829 is a deficient number, since it is larger than the sum of its proper divisors (1).

990217829 is an equidigital number, since it uses as much as digits as its factorization.

990217829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 990217829 is about 31467.7267847552. The cubic root of 990217829 is about 996.7285858532.

The spelling of 990217829 in words is "nine hundred ninety million, two hundred seventeen thousand, eight hundred twenty-nine".