9999875321 has 2 divisors, whose sum is σ = 9999875322.
Its totient is φ = 9999875320.
The previous prime is 9999875299. The next prime is 9999875383. The reversal of 9999875321 is 1235789999.
It is an a-pointer prime, because the next prime (9999875383) can be obtained adding 9999875321 to its sum of digits (62).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 9709343296 + 290532025 = 98536^2 + 17045^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-9999875321 is a prime.
It is a nialpdrome in base 10.
It is not a weakly prime, because it can be changed into another prime (9999875021) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999937660 + 4999937661.
It is an arithmetic number, because the mean of its divisors is an integer number (4999937661).
Almost surely, 29999875321 is an apocalyptic number.
It is an amenable number.
9999875321 is a deficient number, since it is larger than the sum of its proper divisors (1).
9999875321 is an equidigital number, since it uses as much as digits as its factorization.
9999875321 is an evil number, because the sum of its binary digits is even.
The product of its digits is 11022480, while the sum is 62.
The square root of 9999875321 is about 99999.3766030569.
The cubic root of 9999875321 is about 2154.4257362359.
The spelling of 9999875321 in words is "nine billion, nine hundred ninety-nine million, eight hundred seventy-five thousand, three hundred twenty-one".