99705257 has 2 divisors, whose sum is σ = 99705258. Its totient is φ = 99705256.

The previous prime is 99705239. The next prime is 99705259. The reversal of 99705257 is 75250799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73685056 + 26020201 = 8584^2 + 5101^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99705257 is a prime.

It is a super-2 number, since 2×99705257² = 19882276546872098, which contains 22 as substring.

Together with 99705259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99705259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49852628 + 49852629.

It is an arithmetic number, because the mean of its divisors is an integer number (49852629).

Almost surely, 2^99705257 is an apocalyptic number.

It is an amenable number.

99705257 is a deficient number, since it is larger than the sum of its proper divisors (1).

99705257 is an equidigital number, since it uses as much as digits as its factorization.

99705257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 99705257 is about 9985.2519747876. The cubic root of 99705257 is about 463.7024093195.

The spelling of 99705257 in words is "ninety-nine million, seven hundred five thousand, two hundred fifty-seven".