99717281 has 2 divisors, whose sum is σ = 99717282. Its totient is φ = 99717280.

The previous prime is 99717271. The next prime is 99717311. The reversal of 99717281 is 18271799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81739681 + 17977600 = 9041^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 99717281 - 2⁶ = 99717217 is a prime.

It is a super-2 number, since 2×99717281² = 19887072260065922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99717271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49858640 + 49858641.

It is an arithmetic number, because the mean of its divisors is an integer number (49858641).

Almost surely, 2^99717281 is an apocalyptic number.

It is an amenable number.

99717281 is a deficient number, since it is larger than the sum of its proper divisors (1).

99717281 is an equidigital number, since it uses as much as digits as its factorization.

99717281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 44.

The square root of 99717281 is about 9985.8540445973. The cubic root of 99717281 is about 463.7210487033.

The spelling of 99717281 in words is "ninety-nine million, seven hundred seventeen thousand, two hundred eighty-one".