1245311321 has 2 divisors, whose sum is σ = 1245311322. Its totient is φ = 1245311320.

The previous prime is 1245311311. The next prime is 1245311351. The reversal of 1245311321 is 1231135421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1196814025 + 48497296 = 34595^2 + 6964^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245311321 - 2¹⁴ = 1245294937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1245311311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622655660 + 622655661.

It is an arithmetic number, because the mean of its divisors is an integer number (622655661).

Almost surely, 2^1245311321 is an apocalyptic number.

It is an amenable number.

1245311321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245311321 is an equidigital number, since it uses as much as digits as its factorization.

1245311321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 1245311321 is about 35288.9688287997. The cubic root of 1245311321 is about 1075.8687971406.

Adding to 1245311321 its reverse (1231135421), we get a palindrome (2476446742).

The spelling of 1245311321 in words is "one billion, two hundred forty-five million, three hundred eleven thousand, three hundred twenty-one".