1205050013 has 4 divisors (see below), whose sum is σ = 1205281308. Its totient is φ = 1204818720.

The previous prime is 1205050001. The next prime is 1205050037. The reversal of 1205050013 is 3100505021.

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 643028164 + 562021849 = 25358^2 + 23707^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205050013 - 2⁸ = 1205049757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1205049973 and 1205050000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205050213) 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, 107648 + ... + 118313.

It is an arithmetic number, because the mean of its divisors is an integer number (301320327).

Almost surely, 2^1205050013 is an apocalyptic number.

It is an amenable number.

1205050013 is a deficient number, since it is larger than the sum of its proper divisors (231295).

1205050013 is an equidigital number, since it uses as much as digits as its factorization.

1205050013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231294.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1205050013 is about 34713.8302841965. The cubic root of 1205050013 is about 1064.1471606266.

Adding to 1205050013 its reverse (3100505021), we get a palindrome (4305555034).

The spelling of 1205050013 in words is "one billion, two hundred five million, fifty thousand, thirteen".