1326722261 has 4 divisors (see below), whose sum is σ = 1326911712. Its totient is φ = 1326532812.

The previous prime is 1326722237. The next prime is 1326722273. The reversal of 1326722261 is 1622276231.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1622276231 = 71 ⋅22848961.

It is a cyclic number.

It is not a de Polignac number, because 1326722261 - 2²² = 1322527957 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 (1326722461) 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, 83801 + ... + 98366.

It is an arithmetic number, because the mean of its divisors is an integer number (331727928).

Almost surely, 2^1326722261 is an apocalyptic number.

It is an amenable number.

1326722261 is a deficient number, since it is larger than the sum of its proper divisors (189451).

1326722261 is an equidigital number, since it uses as much as digits as its factorization.

1326722261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189450.

The product of its digits is 12096, while the sum is 32.

The square root of 1326722261 is about 36424.1988381351. The cubic root of 1326722261 is about 1098.8202947706.

Adding to 1326722261 its reverse (1622276231), we get a palindrome (2948998492).

The spelling of 1326722261 in words is "one billion, three hundred twenty-six million, seven hundred twenty-two thousand, two hundred sixty-one".