99281321 has 2 divisors, whose sum is σ = 99281322. Its totient is φ = 99281320.

The previous prime is 99281279. The next prime is 99281339. The reversal of 99281321 is 12318299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99281296 + 25 = 9964^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 99281321 - 2⁶ = 99281257 is a prime.

It is not a weakly prime, because it can be changed into another prime (99281521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49640660 + 49640661.

It is an arithmetic number, because the mean of its divisors is an integer number (49640661).

Almost surely, 2^99281321 is an apocalyptic number.

It is an amenable number.

99281321 is a deficient number, since it is larger than the sum of its proper divisors (1).

99281321 is an equidigital number, since it uses as much as digits as its factorization.

99281321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 99281321 is about 9964.0012545162. The cubic root of 99281321 is about 463.0442714471.

The spelling of 99281321 in words is "ninety-nine million, two hundred eighty-one thousand, three hundred twenty-one".