9992921 has 2 divisors, whose sum is σ = 9992922.
Its totient is φ = 9992920.
The previous prime is 9992909. The next prime is 9992933. The reversal of 9992921 is 1292999.
It is a balanced prime because it is at equal distance from previous prime (9992909) and next prime (9992933).
It can be written as a sum of positive squares in only one way, i.e., 8526400 + 1466521 = 2920^2 + 1211^2
It is an emirp because it is prime and its reverse (1292999) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 9992921 - 214 = 9976537 is a prime.
It is a super-2 number, since 2×99929212 = 199716940224482, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (9992321) 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, 4996460 + 4996461.
It is an arithmetic number, because the mean of its divisors is an integer number (4996461).
Almost surely, 29992921 is an apocalyptic number.
It is an amenable number.
9992921 is a deficient number, since it is larger than the sum of its proper divisors (1).
9992921 is an equidigital number, since it uses as much as digits as its factorization.
9992921 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 26244, while the sum is 41.
The square root of 9992921 is about 3161.1581738344.
The cubic root of 9992921 is about 215.3926195253.
The spelling of 9992921 in words is "nine million, nine hundred ninety-two thousand, nine hundred twenty-one".