12115261 has 4 divisors (see below), whose sum is σ = 12261312. Its totient is φ = 11969212.

The previous prime is 12115231. The next prime is 12115267. The reversal of 12115261 is 16251121.

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 an emirpimes, since its reverse is a distinct semiprime: 16251121 = 197 ⋅82493.

It is a cyclic number.

It is not a de Polignac number, because 12115261 - 2⁷ = 12115133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12115267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72901 + ... + 73066.

It is an arithmetic number, because the mean of its divisors is an integer number (3065328).

Almost surely, 2^12115261 is an apocalyptic number.

It is an amenable number.

12115261 is a deficient number, since it is larger than the sum of its proper divisors (146051).

12115261 is an equidigital number, since it uses as much as digits as its factorization.

12115261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146050.

The product of its digits is 120, while the sum is 19.

The square root of 12115261 is about 3480.6983494695. The cubic root of 12115261 is about 229.6735191422.

Adding to 12115261 its reverse (16251121), we get a palindrome (28366382).

The spelling of 12115261 in words is "twelve million, one hundred fifteen thousand, two hundred sixty-one".