99447281 has 2 divisors, whose sum is σ = 99447282. Its totient is φ = 99447280.

The previous prime is 99447277. The next prime is 99447301. The reversal of 99447281 is 18274499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62663056 + 36784225 = 7916^2 + 6065^2 .

It is a cyclic number.

It is not a de Polignac number, because 99447281 - 2² = 99447277 is a prime.

It is a super-2 number, since 2×99447281² = 19779523396585922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99447211) 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, 49723640 + 49723641.

It is an arithmetic number, because the mean of its divisors is an integer number (49723641).

Almost surely, 2^99447281 is an apocalyptic number.

It is an amenable number.

99447281 is a deficient number, since it is larger than the sum of its proper divisors (1).

99447281 is an equidigital number, since it uses as much as digits as its factorization.

99447281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 99447281 is about 9972.3257568132. The cubic root of 99447281 is about 463.3021381731.

The spelling of 99447281 in words is "ninety-nine million, four hundred forty-seven thousand, two hundred eighty-one".