990251267 has 2 divisors, whose sum is σ = 990251268. Its totient is φ = 990251266.

The previous prime is 990251261. The next prime is 990251279. The reversal of 990251267 is 762152099.

It is a weak prime.

It is an emirp because it is prime and its reverse (762152099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990251267 - 2¹⁰ = 990250243 is a prime.

It is not a weakly prime, because it can be changed into another prime (990251261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495125633 + 495125634.

It is an arithmetic number, because the mean of its divisors is an integer number (495125634).

Almost surely, 2^990251267 is an apocalyptic number.

990251267 is a deficient number, since it is larger than the sum of its proper divisors (1).

990251267 is an equidigital number, since it uses as much as digits as its factorization.

990251267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 990251267 is about 31468.2580865227. The cubic root of 990251267 is about 996.7398050127.

The spelling of 990251267 in words is "nine hundred ninety million, two hundred fifty-one thousand, two hundred sixty-seven".