12145491 has 8 divisors (see below), whose sum is σ = 17993360. Its totient is φ = 8096976.

The previous prime is 12145477. The next prime is 12145493. The reversal of 12145491 is 19454121.

12145491 is a `hidden beast` number, since 121 + 454 + 91 = 666.

It is not a de Polignac number, because 12145491 - 2¹³ = 12137299 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 449833 = 12145491 / (1 + 2 + 1 + 4 + 5 + 4 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12145493) 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 in 7 ways as a sum of consecutive naturals, for example, 224890 + ... + 224943.

It is an arithmetic number, because the mean of its divisors is an integer number (2249170).

Almost surely, 2^12145491 is an apocalyptic number.

12145491 is a deficient number, since it is larger than the sum of its proper divisors (5847869).

12145491 is an equidigital number, since it uses as much as digits as its factorization.

12145491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449842 (or 449836 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 12145491 is about 3485.0381633491. The cubic root of 12145491 is about 229.8643876049.

The spelling of 12145491 in words is "twelve million, one hundred forty-five thousand, four hundred ninety-one".