1166261 has 4 divisors (see below), whose sum is σ = 1216992. Its totient is φ = 1115532.

The previous prime is 1166237. The next prime is 1166287. The reversal of 1166261 is 1626611.

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.

It is a cyclic number.

It is not a de Polignac number, because 1166261 - 2¹⁸ = 904117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 50707 = 1166261 / (1 + 1 + 6 + 6 + 2 + 6 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166861) 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, 25331 + ... + 25376.

It is an arithmetic number, because the mean of its divisors is an integer number (304248).

2^1166261 is an apocalyptic number.

It is an amenable number.

1166261 is a deficient number, since it is larger than the sum of its proper divisors (50731).

1166261 is an equidigital number, since it uses as much as digits as its factorization.

1166261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50730.

The product of its digits is 432, while the sum is 23.

The square root of 1166261 is about 1079.9356462308. The cubic root of 1166261 is about 105.2604569439.

The spelling of 1166261 in words is "one million, one hundred sixty-six thousand, two hundred sixty-one".