990286169 has 2 divisors, whose sum is σ = 990286170. Its totient is φ = 990286168.

The previous prime is 990286163. The next prime is 990286181. The reversal of 990286169 is 961682099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 830592400 + 159693769 = 28820^2 + 12637^2 .

It is a cyclic number.

It is not a de Polignac number, because 990286169 - 2⁴ = 990286153 is a prime.

It is a super-2 number, since 2×990286169² = 1961333393025393122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990286163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495143084 + 495143085.

It is an arithmetic number, because the mean of its divisors is an integer number (495143085).

Almost surely, 2^990286169 is an apocalyptic number.

It is an amenable number.

990286169 is a deficient number, since it is larger than the sum of its proper divisors (1).

990286169 is an equidigital number, since it uses as much as digits as its factorization.

990286169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 990286169 is about 31468.8126404540. The cubic root of 990286169 is about 996.7515151059.

The spelling of 990286169 in words is "nine hundred ninety million, two hundred eighty-six thousand, one hundred sixty-nine".