99715181 has 2 divisors, whose sum is σ = 99715182. Its totient is φ = 99715180.

The previous prime is 99715163. The next prime is 99715201. The reversal of 99715181 is 18151799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87254281 + 12460900 = 9341^2 + 3530^2 .

It is an emirp because it is prime and its reverse (18151799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99715181 - 2²⁶ = 32606317 is a prime.

It is a super-2 number, since 2×99715181² = 19886234643725522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99715141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49857590 + 49857591.

It is an arithmetic number, because the mean of its divisors is an integer number (49857591).

Almost surely, 2^99715181 is an apocalyptic number.

It is an amenable number.

99715181 is a deficient number, since it is larger than the sum of its proper divisors (1).

99715181 is an equidigital number, since it uses as much as digits as its factorization.

99715181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 41.

The square root of 99715181 is about 9985.7488953007. The cubic root of 99715181 is about 463.7177934299.

The spelling of 99715181 in words is "ninety-nine million, seven hundred fifteen thousand, one hundred eighty-one".