12278591 has 8 divisors (see below), whose sum is σ = 13269984. Its totient is φ = 11293920.

The previous prime is 12278569. The next prime is 12278599. The reversal of 12278591 is 19587221.

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 12278591 - 2¹⁰ = 12277567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2525 + ... + 5561.

It is an arithmetic number, because the mean of its divisors is an integer number (1658748).

Almost surely, 2^12278591 is an apocalyptic number.

12278591 is a deficient number, since it is larger than the sum of its proper divisors (991393).

12278591 is a wasteful number, since it uses less digits than its factorization.

12278591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361.

The product of its digits is 10080, while the sum is 35.

The square root of 12278591 is about 3504.0820481262. The cubic root of 12278591 is about 230.7010180927.

The spelling of 12278591 in words is "twelve million, two hundred seventy-eight thousand, five hundred ninety-one".