990100217 has 2 divisors, whose sum is σ = 990100218. Its totient is φ = 990100216.

The previous prime is 990100193. The next prime is 990100231. The reversal of 990100217 is 712001099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 973689616 + 16410601 = 31204^2 + 4051^2 .

It is a cyclic number.

It is not a de Polignac number, because 990100217 - 2¹⁴ = 990083833 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990100217.

It is not a weakly prime, because it can be changed into another prime (990100117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495050108 + 495050109.

It is an arithmetic number, because the mean of its divisors is an integer number (495050109).

Almost surely, 2^990100217 is an apocalyptic number.

It is an amenable number.

990100217 is a deficient number, since it is larger than the sum of its proper divisors (1).

990100217 is an equidigital number, since it uses as much as digits as its factorization.

990100217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 990100217 is about 31465.8579574751. The cubic root of 990100217 is about 996.6891225215.

The spelling of 990100217 in words is "nine hundred ninety million, one hundred thousand, two hundred seventeen".