1091261 has 2 divisors, whose sum is σ = 1091262. Its totient is φ = 1091260.

The previous prime is 1091257. The next prime is 1091263. The reversal of 1091261 is 1621901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1038361 + 52900 = 1019^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091261 - 2² = 1091257 is a prime.

Together with 1091263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091263) 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, 545630 + 545631.

It is an arithmetic number, because the mean of its divisors is an integer number (545631).

2^1091261 is an apocalyptic number.

It is an amenable number.

1091261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091261 is an equidigital number, since it uses as much as digits as its factorization.

1091261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1091261 is about 1044.6343858020. The cubic root of 1091261 is about 102.9539178659.

The spelling of 1091261 in words is "one million, ninety-one thousand, two hundred sixty-one".