9975181 has 2 divisors, whose sum is σ = 9975182. Its totient is φ = 9975180.

The previous prime is 9975157. The next prime is 9975187. The reversal of 9975181 is 1815799.

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., 8462281 + 1512900 = 2909^2 + 1230^2 .

It is an emirp because it is prime and its reverse (1815799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9975181 - 2¹¹ = 9973133 is a prime.

It is a super-2 number, since 2×9975181² = 199008471965522, which contains 22 as substring.

9975181 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9975187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4987590 + 4987591.

It is an arithmetic number, because the mean of its divisors is an integer number (4987591).

Almost surely, 2^9975181 is an apocalyptic number.

It is an amenable number.

9975181 is a deficient number, since it is larger than the sum of its proper divisors (1).

9975181 is an equidigital number, since it uses as much as digits as its factorization.

9975181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 40.

The square root of 9975181 is about 3158.3509937941. The cubic root of 9975181 is about 215.2650849627.

The spelling of 9975181 in words is "nine million, nine hundred seventy-five thousand, one hundred eighty-one".