99999257 has 2 divisors, whose sum is σ = 99999258.
Its totient is φ = 99999256.
The previous prime is 99999247. The next prime is 99999259. The reversal of 99999257 is 75299999.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 61011721 + 38987536 = 7811^2 + 6244^2
It is a cyclic number.
It is not a de Polignac number, because 99999257 - 220 = 98950681 is a prime.
Together with 99999259, it forms a pair of twin primes.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 99999196 and 99999205.
It is not a weakly prime, because it can be changed into another prime (99999259) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999628 + 49999629.
It is an arithmetic number, because the mean of its divisors is an integer number (49999629).
Almost surely, 299999257 is an apocalyptic number.
It is an amenable number.
99999257 is a deficient number, since it is larger than the sum of its proper divisors (1).
99999257 is an equidigital number, since it uses as much as digits as its factorization.
99999257 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 4133430, while the sum is 59.
The square root of 99999257 is about 9999.9628499310.
The cubic root of 99999257 is about 464.1577337916.
The spelling of 99999257 in words is "ninety-nine million, nine hundred ninety-nine thousand, two hundred fifty-seven".