99967997 has 2 divisors, whose sum is σ = 99967998. Its totient is φ = 99967996.

The previous prime is 99967993. The next prime is 99967999. The reversal of 99967997 is 79976999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51998521 + 47969476 = 7211^2 + 6926^2 .

It is a cyclic number.

It is not a de Polignac number, because 99967997 - 2² = 99967993 is a prime.

Together with 99967999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99967993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49983998 + 49983999.

It is an arithmetic number, because the mean of its divisors is an integer number (49983999).

Almost surely, 2^99967997 is an apocalyptic number.

It is an amenable number.

99967997 is a deficient number, since it is larger than the sum of its proper divisors (1).

99967997 is an equidigital number, since it uses as much as digits as its factorization.

99967997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17360406, while the sum is 65.

The square root of 99967997 is about 9998.3997219555. The cubic root of 99967997 is about 464.1093631558.

The spelling of 99967997 in words is "ninety-nine million, nine hundred sixty-seven thousand, nine hundred ninety-seven".