9149981 has 2 divisors, whose sum is σ = 9149982. Its totient is φ = 9149980.

The previous prime is 9149977. The next prime is 9149999. The reversal of 9149981 is 1899419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8357881 + 792100 = 2891^2 + 890^2 .

It is an emirp because it is prime and its reverse (1899419) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9149981 - 2² = 9149977 is a prime.

It is a super-2 number, since 2×9149981² = 167444304600722, 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 (9149951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4574990 + 4574991.

It is an arithmetic number, because the mean of its divisors is an integer number (4574991).

Almost surely, 2^9149981 is an apocalyptic number.

It is an amenable number.

9149981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9149981 is an equidigital number, since it uses as much as digits as its factorization.

9149981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 41.

The square root of 9149981 is about 3024.8935518461. The cubic root of 9149981 is about 209.1574784371.

The spelling of 9149981 in words is "nine million, one hundred forty-nine thousand, nine hundred eighty-one".