1326340261 has 4 divisors (see below), whose sum is σ = 1326638412. Its totient is φ = 1326042112.

The previous prime is 1326340247. The next prime is 1326340271. The reversal of 1326340261 is 1620436231.

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 454968900 + 871371361 = 21330^2 + 29519^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326340261 - 2⁵ = 1326340229 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 (1326340271) 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, 142300 + ... + 151333.

It is an arithmetic number, because the mean of its divisors is an integer number (331659603).

Almost surely, 2^1326340261 is an apocalyptic number.

It is an amenable number.

1326340261 is a deficient number, since it is larger than the sum of its proper divisors (298151).

1326340261 is an equidigital number, since it uses as much as digits as its factorization.

1326340261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298150.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1326340261 is about 36418.9546939502. The cubic root of 1326340261 is about 1098.7148244052.

Adding to 1326340261 its reverse (1620436231), we get a palindrome (2946776492).

The spelling of 1326340261 in words is "one billion, three hundred twenty-six million, three hundred forty thousand, two hundred sixty-one".