990472801 has 2 divisors, whose sum is σ = 990472802.
Its totient is φ = 990472800.
The previous prime is 990472753. The next prime is 990472811. The reversal of 990472801 is 108274099.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 915667600 + 74805201 = 30260^2 + 8649^2
It is a cyclic number.
It is not a de Polignac number, because 990472801 - 211 = 990470753 is a prime.
It is a Chen prime.
It is equal to p50387566 and since 990472801 and 50387566 have the same sum of digits, it is a Honaker prime.
It is not a weakly prime, because it can be changed into another prime (990472811) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495236400 + 495236401.
It is an arithmetic number, because the mean of its divisors is an integer number (495236401).
Almost surely, 2990472801 is an apocalyptic number.
990472801 is the 19905-th centered pentagonal number.
It is an amenable number.
990472801 is a deficient number, since it is larger than the sum of its proper divisors (1).
990472801 is an equidigital number, since it uses as much as digits as its factorization.
990472801 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 36288, while the sum is 40.
The square root of 990472801 is about 31471.7778493685.
Note that the first 3 decimals coincide.
The cubic root of 990472801 is about 996.8141279982.
The spelling of 990472801 in words is "nine hundred ninety million, four hundred seventy-two thousand, eight hundred one".