12312261 has 24 divisors (see below), whose sum is σ = 19568640. Its totient is φ = 7412256.

The previous prime is 12312241. The next prime is 12312263. The reversal of 12312261 is 16221321.

12312261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12312261 - 2⁶ = 12312197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4380 + ... + 6618.

It is an arithmetic number, because the mean of its divisors is an integer number (815360).

Almost surely, 2^12312261 is an apocalyptic number.

It is an amenable number.

12312261 is a deficient number, since it is larger than the sum of its proper divisors (7256379).

12312261 is a wasteful number, since it uses less digits than its factorization.

12312261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305 (or 2302 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 12312261 is about 3508.8831556494. The cubic root of 12312261 is about 230.9116995395.

Adding to 12312261 its reverse (16221321), we get a palindrome (28533582).

The spelling of 12312261 in words is "twelve million, three hundred twelve thousand, two hundred sixty-one".