12231655 has 4 divisors (see below), whose sum is σ = 14677992. Its totient is φ = 9785320.

The previous prime is 12231647. The next prime is 12231671. The reversal of 12231655 is 55613221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55613221 = 433 ⋅128437.

It is not a de Polignac number, because 12231655 - 2³ = 12231647 is a prime.

It is a super-2 number, since 2×12231655² = 299226768078050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1223161 + ... + 1223170.

It is an arithmetic number, because the mean of its divisors is an integer number (3669498).

Almost surely, 2^12231655 is an apocalyptic number.

12231655 is a deficient number, since it is larger than the sum of its proper divisors (2446337).

12231655 is an equidigital number, since it uses as much as digits as its factorization.

12231655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446336.

The product of its digits is 1800, while the sum is 25.

The square root of 12231655 is about 3497.3783038156. The cubic root of 12231655 is about 230.4066843864.

Adding to 12231655 its reverse (55613221), we get a palindrome (67844876).

The spelling of 12231655 in words is "twelve million, two hundred thirty-one thousand, six hundred fifty-five".