1305530000 has 50 divisors (see below), whose sum is σ = 3160842894. Its totient is φ = 522208000.

The previous prime is 1305529999. The next prime is 1305530021. The reversal of 1305530000 is 355031.

It can be written as a sum of positive squares in 5 ways, for example, as 901680784 + 403849216 = 30028^2 + 20096^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 55277 + ... + 75276.

Almost surely, 2^1305530000 is an apocalyptic number.

1305530000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305530000 is an abundant number, since it is smaller than the sum of its proper divisors (1855312894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1305530000 is an equidigital number, since it uses as much as digits as its factorization.

1305530000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130581 (or 130560 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 17.

The square root of 1305530000 is about 36132.1186757710. The cubic root of 1305530000 is about 1092.9382330404.

Adding to 1305530000 its reverse (355031), we get a palindrome (1305885031).

The spelling of 1305530000 in words is "one billion, three hundred five million, five hundred thirty thousand".