1305405245 has 4 divisors (see below), whose sum is σ = 1566486300. Its totient is φ = 1044324192.

The previous prime is 1305405229. The next prime is 1305405247. The reversal of 1305405245 is 5425045031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5425045031 = 7 ⋅775006433.

It can be written as a sum of positive squares in 2 ways, for example, as 1032593956 + 272811289 = 32134^2 + 16517^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305405245 - 2⁴ = 1305405229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305405247) 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, 130540520 + ... + 130540529.

It is an arithmetic number, because the mean of its divisors is an integer number (391621575).

Almost surely, 2^1305405245 is an apocalyptic number.

It is an amenable number.

1305405245 is a deficient number, since it is larger than the sum of its proper divisors (261081055).

1305405245 is an equidigital number, since it uses as much as digits as its factorization.

1305405245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261081054.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 1305405245 is about 36130.3922619171. The cubic root of 1305405245 is about 1092.9034186093.

The spelling of 1305405245 in words is "one billion, three hundred five million, four hundred five thousand, two hundred forty-five".