990251279 has 2 divisors, whose sum is σ = 990251280. Its totient is φ = 990251278.

The previous prime is 990251267. The next prime is 990251287. The reversal of 990251279 is 972152099.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (972152099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990251279 - 2²⁰ = 989202703 is a prime.

It is a super-2 number, since 2×990251279² = 1961195191122271682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990251299) 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, 495125639 + 495125640.

It is an arithmetic number, because the mean of its divisors is an integer number (495125640).

Almost surely, 2^990251279 is an apocalyptic number.

990251279 is a deficient number, since it is larger than the sum of its proper divisors (1).

990251279 is an equidigital number, since it uses as much as digits as its factorization.

990251279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 990251279 is about 31468.2582771910. The cubic root of 990251279 is about 996.7398090389.

The spelling of 990251279 in words is "nine hundred ninety million, two hundred fifty-one thousand, two hundred seventy-nine".