1245320009 has 4 divisors (see below), whose sum is σ = 1245505920. Its totient is φ = 1245134100.

The previous prime is 1245319997. The next prime is 1245320017. The reversal of 1245320009 is 9000235421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9000235421 = 17 ⋅529425613.

It is a cyclic number.

It is not a de Polignac number, because 1245320009 - 2¹⁶ = 1245254473 is a prime.

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 1245320009.

It is not an unprimeable number, because it can be changed into a prime (1245320039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82517 + ... + 96434.

It is an arithmetic number, because the mean of its divisors is an integer number (311376480).

Almost surely, 2^1245320009 is an apocalyptic number.

It is an amenable number.

1245320009 is a deficient number, since it is larger than the sum of its proper divisors (185911).

1245320009 is an equidigital number, since it uses as much as digits as its factorization.

1245320009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185910.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1245320009 is about 35289.0919265430. The cubic root of 1245320009 is about 1075.8712990923.

The spelling of 1245320009 in words is "one billion, two hundred forty-five million, three hundred twenty thousand, nine".