12291137 has 4 divisors (see below), whose sum is σ = 12307140. Its totient is φ = 12275136.

The previous prime is 12291121. The next prime is 12291179. The reversal of 12291137 is 73119221.

12291137 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 11587216 + 703921 = 3404^2 + 839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12291137 - 2⁴ = 12291121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12290137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6788 + ... + 8405.

It is an arithmetic number, because the mean of its divisors is an integer number (3076785).

Almost surely, 2^12291137 is an apocalyptic number.

It is an amenable number.

12291137 is a deficient number, since it is larger than the sum of its proper divisors (16003).

12291137 is an equidigital number, since it uses as much as digits as its factorization.

12291137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16002.

The product of its digits is 756, while the sum is 26.

The square root of 12291137 is about 3505.8717888708. The cubic root of 12291137 is about 230.7795664573.

The spelling of 12291137 in words is "twelve million, two hundred ninety-one thousand, one hundred thirty-seven".