12147491 has 8 divisors (see below), whose sum is σ = 12611280. Its totient is φ = 11686752.

The previous prime is 12147463. The next prime is 12147529. The reversal of 12147491 is 19474121.

12147491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12147491 - 2¹⁸ = 11885347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12147391) 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, 10256 + ... + 11378.

It is an arithmetic number, because the mean of its divisors is an integer number (1576410).

Almost surely, 2^12147491 is an apocalyptic number.

12147491 is a deficient number, since it is larger than the sum of its proper divisors (463789).

12147491 is a wasteful number, since it uses less digits than its factorization.

12147491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525.

The product of its digits is 2016, while the sum is 29.

The square root of 12147491 is about 3485.3250924412. The cubic root of 12147491 is about 229.8770041812.

The spelling of 12147491 in words is "twelve million, one hundred forty-seven thousand, four hundred ninety-one".