12147731 has 4 divisors (see below), whose sum is σ = 12174432. Its totient is φ = 12121032.

The previous prime is 12147727. The next prime is 12147739. The reversal of 12147731 is 13774121.

It is a happy number.

12147731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13774121 = 229 ⋅60149.

It is a cyclic number.

It is not a de Polignac number, because 12147731 - 2² = 12147727 is a prime.

It is a super-2 number, since 2×12147731² = 295134736896722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12147731.

It is not an unprimeable number, because it can be changed into a prime (12147739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12656 + ... + 13581.

It is an arithmetic number, because the mean of its divisors is an integer number (3043608).

Almost surely, 2^12147731 is an apocalyptic number.

12147731 is a deficient number, since it is larger than the sum of its proper divisors (26701).

12147731 is an equidigital number, since it uses as much as digits as its factorization.

12147731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26700.

The product of its digits is 1176, while the sum is 26.

The square root of 12147731 is about 3485.3595223449. The cubic root of 12147731 is about 229.8785180773.

The spelling of 12147731 in words is "twelve million, one hundred forty-seven thousand, seven hundred thirty-one".