9815149 has 2 divisors, whose sum is σ = 9815150. Its totient is φ = 9815148.

The previous prime is 9815147. The next prime is 9815159. The reversal of 9815149 is 9415189.

9815149 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5673924 + 4141225 = 2382^2 + 2035^2 .

It is a cyclic number.

It is not a de Polignac number, because 9815149 - 2¹ = 9815147 is a prime.

Together with 9815147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9815147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4907574 + 4907575.

It is an arithmetic number, because the mean of its divisors is an integer number (4907575).

Almost surely, 2^9815149 is an apocalyptic number.

It is an amenable number.

9815149 is a deficient number, since it is larger than the sum of its proper divisors (1).

9815149 is an equidigital number, since it uses as much as digits as its factorization.

9815149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 37.

The square root of 9815149 is about 3132.9138194339. The cubic root of 9815149 is about 214.1077062854.

The spelling of 9815149 in words is "nine million, eight hundred fifteen thousand, one hundred forty-nine".