12291289 has 8 divisors (see below), whose sum is σ = 13366728. Its totient is φ = 11255040.

The previous prime is 12291287. The next prime is 12291313. The reversal of 12291289 is 98219221.

It can be written as a sum of positive squares in 4 ways, for example, as 4338889 + 7952400 = 2083^2 + 2820^2 .

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 12291289 - 2¹ = 12291287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12291287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9142 + ... + 10399.

It is an arithmetic number, because the mean of its divisors is an integer number (1670841).

Almost surely, 2^12291289 is an apocalyptic number.

It is an amenable number.

12291289 is a deficient number, since it is larger than the sum of its proper divisors (1075439).

12291289 is a wasteful number, since it uses less digits than its factorization.

12291289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19595.

The product of its digits is 5184, while the sum is 34.

The square root of 12291289 is about 3505.8934667214. The cubic root of 12291289 is about 230.7805177756.

The spelling of 12291289 in words is "twelve million, two hundred ninety-one thousand, two hundred eighty-nine".