9148991 has 2 divisors, whose sum is σ = 9148992. Its totient is φ = 9148990.

The previous prime is 9148961. The next prime is 9149011. The reversal of 9148991 is 1998419.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9148991 - 2⁶ = 9148927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9148961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4574495 + 4574496.

It is an arithmetic number, because the mean of its divisors is an integer number (4574496).

Almost surely, 2^9148991 is an apocalyptic number.

9148991 is a deficient number, since it is larger than the sum of its proper divisors (1).

9148991 is an equidigital number, since it uses as much as digits as its factorization.

9148991 is an evil number, because the sum of its binary digits is even.

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

The square root of 9148991 is about 3024.7299052973. The cubic root of 9148991 is about 209.1499347649.

The spelling of 9148991 in words is "nine million, one hundred forty-eight thousand, nine hundred ninety-one".