1245305213 has 4 divisors (see below), whose sum is σ = 1245987168. Its totient is φ = 1244623260.

The previous prime is 1245305183. The next prime is 1245305297. The reversal of 1245305213 is 3125035421.

It is a happy number.

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: 3125035421 = 17 ⋅183825613.

It is a cyclic number.

It is not a de Polignac number, because 1245305213 - 2³⁰ = 171563389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245305713) 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, 338231 + ... + 341892.

It is an arithmetic number, because the mean of its divisors is an integer number (311496792).

Almost surely, 2^1245305213 is an apocalyptic number.

It is an amenable number.

1245305213 is a deficient number, since it is larger than the sum of its proper divisors (681955).

1245305213 is an equidigital number, since it uses as much as digits as its factorization.

1245305213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681954.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1245305213 is about 35288.8822860685. The cubic root of 1245305213 is about 1075.8670381648.

The spelling of 1245305213 in words is "one billion, two hundred forty-five million, three hundred five thousand, two hundred thirteen".