99967121 has 2 divisors, whose sum is σ = 99967122. Its totient is φ = 99967120.

The previous prime is 99967103. The next prime is 99967139. The reversal of 99967121 is 12176999.

It is a balanced prime because it is at equal distance from previous prime (99967103) and next prime (99967139).

It can be written as a sum of positive squares in only one way, i.e., 75603025 + 24364096 = 8695^2 + 4936^2 .

It is an emirp because it is prime and its reverse (12176999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99967121 is a prime.

It is not a weakly prime, because it can be changed into another prime (99967171) 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, 49983560 + 49983561.

It is an arithmetic number, because the mean of its divisors is an integer number (49983561).

Almost surely, 2^99967121 is an apocalyptic number.

It is an amenable number.

99967121 is a deficient number, since it is larger than the sum of its proper divisors (1).

99967121 is an equidigital number, since it uses as much as digits as its factorization.

99967121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 44.

The square root of 99967121 is about 9998.3559148492. The cubic root of 99967121 is about 464.1080075186.

The spelling of 99967121 in words is "ninety-nine million, nine hundred sixty-seven thousand, one hundred twenty-one".