1291261 has 4 divisors (see below), whose sum is σ = 1294524. Its totient is φ = 1288000.

The previous prime is 1291249. The next prime is 1291271. The reversal of 1291261 is 1621921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 534361 + 756900 = 731^2 + 870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291261 - 2⁵ = 1291229 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291211) 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, 940 + ... + 1861.

It is an arithmetic number, because the mean of its divisors is an integer number (323631).

2^1291261 is an apocalyptic number.

It is an amenable number.

1291261 is a deficient number, since it is larger than the sum of its proper divisors (3263).

1291261 is an equidigital number, since it uses as much as digits as its factorization.

1291261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262.

The product of its digits is 216, while the sum is 22.

The square root of 1291261 is about 1136.3366578616. The cubic root of 1291261 is about 108.8941822978.

The spelling of 1291261 in words is "one million, two hundred ninety-one thousand, two hundred sixty-one".