990055777 has 2 divisors, whose sum is σ = 990055778. Its totient is φ = 990055776.

The previous prime is 990055771. The next prime is 990055783. The reversal of 990055777 is 777550099.

It is a balanced prime because it is at equal distance from previous prime (990055771) and next prime (990055783).

It can be written as a sum of positive squares in only one way, i.e., 857552656 + 132503121 = 29284^2 + 11511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990055777 is a prime.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 990055777.

It is not a weakly prime, because it can be changed into another prime (990055771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495027888 + 495027889.

It is an arithmetic number, because the mean of its divisors is an integer number (495027889).

Almost surely, 2^990055777 is an apocalyptic number.

It is an amenable number.

990055777 is a deficient number, since it is larger than the sum of its proper divisors (1).

990055777 is an equidigital number, since it uses as much as digits as its factorization.

990055777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 694575, while the sum is 49.

The square root of 990055777 is about 31465.1517873345. The cubic root of 990055777 is about 996.6742103855.

The spelling of 990055777 in words is "nine hundred ninety million, fifty-five thousand, seven hundred seventy-seven".