11312261 has 2 divisors, whose sum is σ = 11312262. Its totient is φ = 11312260.

The previous prime is 11312221. The next prime is 11312281. The reversal of 11312261 is 16221311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9796900 + 1515361 = 3130^2 + 1231^2 .

It is an emirp because it is prime and its reverse (16221311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11312261 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11312221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5656130 + 5656131.

It is an arithmetic number, because the mean of its divisors is an integer number (5656131).

Almost surely, 2^11312261 is an apocalyptic number.

It is an amenable number.

11312261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11312261 is an equidigital number, since it uses as much as digits as its factorization.

11312261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 11312261 is about 3363.3704821206. The cubic root of 11312261 is about 224.4828352477.

Adding to 11312261 its reverse (16221311), we get a palindrome (27533572).

It can be divided in two parts, 1131 and 2261, that multiplied together give a triangular number (2557191 = T₂₂₆₁).

The spelling of 11312261 in words is "eleven million, three hundred twelve thousand, two hundred sixty-one".