12491261 has 4 divisors (see below), whose sum is σ = 12499872. Its totient is φ = 12482652.

The previous prime is 12491201. The next prime is 12491273. The reversal of 12491261 is 16219421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12491261 - 2⁶ = 12491197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12491261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491201) 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 3 ways as a sum of consecutive naturals, for example, 1535 + ... + 5228.

It is an arithmetic number, because the mean of its divisors is an integer number (3124968).

Almost surely, 2^12491261 is an apocalyptic number.

It is an amenable number.

12491261 is a deficient number, since it is larger than the sum of its proper divisors (8611).

12491261 is an equidigital number, since it uses as much as digits as its factorization.

12491261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8610.

The product of its digits is 864, while the sum is 26.

The square root of 12491261 is about 3534.2978086177. The cubic root of 12491261 is about 232.0253452790.

The spelling of 12491261 in words is "twelve million, four hundred ninety-one thousand, two hundred sixty-one".