1331223617 has 2 divisors, whose sum is σ = 1331223618. Its totient is φ = 1331223616.

The previous prime is 1331223613. The next prime is 1331223623. The reversal of 1331223617 is 7163221331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 981944896 + 349278721 = 31336^2 + 18689^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331223617 - 2² = 1331223613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331223617.

It is not a weakly prime, because it can be changed into another prime (1331223611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665611808 + 665611809.

It is an arithmetic number, because the mean of its divisors is an integer number (665611809).

Almost surely, 2^1331223617 is an apocalyptic number.

It is an amenable number.

1331223617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331223617 is an equidigital number, since it uses as much as digits as its factorization.

1331223617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 29.

The square root of 1331223617 is about 36485.9372498501. The cubic root of 1331223617 is about 1100.0615990298.

Adding to 1331223617 its reverse (7163221331), we get a palindrome (8494444948).

The spelling of 1331223617 in words is "one billion, three hundred thirty-one million, two hundred twenty-three thousand, six hundred seventeen".