1245311329 has 4 divisors (see below), whose sum is σ = 1245520900. Its totient is φ = 1245101760.

The previous prime is 1245311321. The next prime is 1245311351. The reversal of 1245311329 is 9231135421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 179158225 + 1066153104 = 13385^2 + 32652^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245311329 - 2³ = 1245311321 is a prime.

It is a super-2 number, since 2×1245311329² = 3101600612271492482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245311329.

It is not an unprimeable number, because it can be changed into a prime (1245311321) 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, 95604 + ... + 107845.

It is an arithmetic number, because the mean of its divisors is an integer number (311380225).

Almost surely, 2^1245311329 is an apocalyptic number.

It is an amenable number.

1245311329 is a deficient number, since it is larger than the sum of its proper divisors (209571).

1245311329 is an equidigital number, since it uses as much as digits as its factorization.

1245311329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209570.

The product of its digits is 6480, while the sum is 31.

The square root of 1245311329 is about 35288.9689421496. The cubic root of 1245311329 is about 1075.8687994445.

The spelling of 1245311329 in words is "one billion, two hundred forty-five million, three hundred eleven thousand, three hundred twenty-nine".