1305125513 has 16 divisors (see below), whose sum is σ = 1428295680. Its totient is φ = 1187212800.

The previous prime is 1305125491. The next prime is 1305125527. The reversal of 1305125513 is 3155215031.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1305125513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1305125573) 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, 757493 + ... + 759213.

It is an arithmetic number, because the mean of its divisors is an integer number (89268480).

Almost surely, 2^1305125513 is an apocalyptic number.

It is an amenable number.

1305125513 is a deficient number, since it is larger than the sum of its proper divisors (123170167).

1305125513 is a wasteful number, since it uses less digits than its factorization.

1305125513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 1305125513 is about 36126.5209091604. The cubic root of 1305125513 is about 1092.8253478594.

The spelling of 1305125513 in words is "one billion, three hundred five million, one hundred twenty-five thousand, five hundred thirteen".