1331225617 has 2 divisors, whose sum is σ = 1331225618. Its totient is φ = 1331225616.

The previous prime is 1331225587. The next prime is 1331225659. The reversal of 1331225617 is 7165221331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 818474881 + 512750736 = 28609^2 + 22644^2 .

It is an emirp because it is prime and its reverse (7165221331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331225617 - 2¹⁹ = 1330701329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331225677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665612808 + 665612809.

It is an arithmetic number, because the mean of its divisors is an integer number (665612809).

Almost surely, 2^1331225617 is an apocalyptic number.

It is an amenable number.

1331225617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331225617 is an equidigital number, since it uses as much as digits as its factorization.

1331225617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 1331225617 is about 36485.9646576598. The cubic root of 1331225617 is about 1100.0621499320.

Adding to 1331225617 its reverse (7165221331), we get a palindrome (8496446948).

The spelling of 1331225617 in words is "one billion, three hundred thirty-one million, two hundred twenty-five thousand, six hundred seventeen".