1305210205 has 16 divisors (see below), whose sum is σ = 1741146624. Its totient is φ = 932754240.

The previous prime is 1305210191. The next prime is 1305210209. The reversal of 1305210205 is 5020125031.

It is not a de Polignac number, because 1305210205 - 2²⁵ = 1271655773 is a prime.

It is a super-2 number, since 2×1305210205² = 3407147358472284050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305210209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321859 + ... + 325888.

It is an arithmetic number, because the mean of its divisors is an integer number (108821664).

Almost surely, 2^1305210205 is an apocalyptic number.

It is an amenable number.

1305210205 is a deficient number, since it is larger than the sum of its proper divisors (435936419).

1305210205 is a wasteful number, since it uses less digits than its factorization.

1305210205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647796.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1305210205 is about 36127.6930484082. The cubic root of 1305210205 is about 1092.8489858318.

Adding to 1305210205 its reverse (5020125031), we get a palindrome (6325335236).

The spelling of 1305210205 in words is "one billion, three hundred five million, two hundred ten thousand, two hundred five".