99707281 has 2 divisors, whose sum is σ = 99707282. Its totient is φ = 99707280.

The previous prime is 99707219. The next prime is 99707291. The reversal of 99707281 is 18270799.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99700225 + 7056 = 9985^2 + 84^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99707281 is a prime.

It is a super-2 number, since 2×99707281² = 19883083768825922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99707291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49853640 + 49853641.

It is an arithmetic number, because the mean of its divisors is an integer number (49853641).

Almost surely, 2^99707281 is an apocalyptic number.

It is an amenable number.

99707281 is a deficient number, since it is larger than the sum of its proper divisors (1).

99707281 is an equidigital number, since it uses as much as digits as its factorization.

99707281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 99707281 is about 9985.3533237437. The cubic root of 99707281 is about 463.7055469920.

The spelling of 99707281 in words is "ninety-nine million, seven hundred seven thousand, two hundred eighty-one".