990252271 has 2 divisors, whose sum is σ = 990252272.
Its totient is φ = 990252270.
The previous prime is 990252269. The next prime is 990252287. The reversal of 990252271 is 172252099.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 990252271 - 21 = 990252269 is a prime.
Together with 990252269, it forms a pair of twin primes.
It is a self number, because there is not a number n which added to its sum of digits gives 990252271.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (990252671) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495126135 + 495126136.
It is an arithmetic number, because the mean of its divisors is an integer number (495126136).
Almost surely, 2990252271 is an apocalyptic number.
990252271 is the 16821-st centered heptagonal number.
990252271 is a deficient number, since it is larger than the sum of its proper divisors (1).
990252271 is an equidigital number, since it uses as much as digits as its factorization.
990252271 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 22680, while the sum is 37.
The square root of 990252271 is about 31468.2740391017.
The cubic root of 990252271 is about 996.7401418721.
The spelling of 990252271 in words is "nine hundred ninety million, two hundred fifty-two thousand, two hundred seventy-one".