1321442641 has 2 divisors, whose sum is σ = 1321442642. Its totient is φ = 1321442640.

The previous prime is 1321442597. The next prime is 1321442651. The reversal of 1321442641 is 1462441231.

1321442641 = 25704² + 25705².

It is the 14841-st star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660747025 + 660695616 = 25705^2 + 25704^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321442641 - 2⁷ = 1321442513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321442651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660721320 + 660721321.

It is an arithmetic number, because the mean of its divisors is an integer number (660721321).

Almost surely, 2^1321442641 is an apocalyptic number.

1321442641 is the 25705-th centered square number.

It is an amenable number.

1321442641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321442641 is an equidigital number, since it uses as much as digits as its factorization.

1321442641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 1321442641 is about 36351.6525208965. The cubic root of 1321442641 is about 1097.3607915961.

Adding to 1321442641 its reverse (1462441231), we get a palindrome (2783883872).

It can be divided in two parts, 13214 and 42641, that added together give a palindrome (55855).

The spelling of 1321442641 in words is "one billion, three hundred twenty-one million, four hundred forty-two thousand, six hundred forty-one".