99993997 has 2 divisors, whose sum is σ = 99993998.
Its totient is φ = 99993996.
The previous prime is 99993991. The next prime is 99994009. The reversal of 99993997 is 79939999.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 52577001 + 47416996 = 7251^2 + 6886^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-99993997 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99993991) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49996998 + 49996999.
It is an arithmetic number, because the mean of its divisors is an integer number (49996999).
Almost surely, 299993997 is an apocalyptic number.
It is an amenable number.
99993997 is a deficient number, since it is larger than the sum of its proper divisors (1).
99993997 is an equidigital number, since it uses as much as digits as its factorization.
99993997 is an evil number, because the sum of its binary digits is even.
The product of its digits is 11160261, while the sum is 64.
The square root of 99993997 is about 9999.6998454954.
The cubic root of 99993997 is about 464.1495953562.
The spelling of 99993997 in words is "ninety-nine million, nine hundred ninety-three thousand, nine hundred ninety-seven".