1321440611 has 4 divisors (see below), whose sum is σ = 1352171832. Its totient is φ = 1290709392.

The previous prime is 1321440559. The next prime is 1321440647. The reversal of 1321440611 is 1160441231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1160441231 = 3079 ⋅376889.

It is a cyclic number.

It is not a de Polignac number, because 1321440611 - 2¹⁴ = 1321424227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321440661) 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, 15365546 + ... + 15365631.

It is an arithmetic number, because the mean of its divisors is an integer number (338042958).

Almost surely, 2^1321440611 is an apocalyptic number.

1321440611 is a deficient number, since it is larger than the sum of its proper divisors (30731221).

1321440611 is an equidigital number, since it uses as much as digits as its factorization.

1321440611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30731220.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1321440611 is about 36351.6245991840. The cubic root of 1321440611 is about 1097.3602296740.

Adding to 1321440611 its reverse (1160441231), we get a palindrome (2481881842).

The spelling of 1321440611 in words is "one billion, three hundred twenty-one million, four hundred forty thousand, six hundred eleven".