990880243 has 2 divisors, whose sum is σ = 990880244. Its totient is φ = 990880242.

The previous prime is 990880211. The next prime is 990880277. The reversal of 990880243 is 342088099.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (342088099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990880243 - 2⁵ = 990880211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990880243.

It is not a weakly prime, because it can be changed into another prime (990880283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495440121 + 495440122.

It is an arithmetic number, because the mean of its divisors is an integer number (495440122).

Almost surely, 2^990880243 is an apocalyptic number.

990880243 is a deficient number, since it is larger than the sum of its proper divisors (1).

990880243 is an equidigital number, since it uses as much as digits as its factorization.

990880243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 990880243 is about 31478.2503166869. The cubic root of 990880243 is about 996.9507927855.

The spelling of 990880243 in words is "nine hundred ninety million, eight hundred eighty thousand, two hundred forty-three".