1305645425 has 36 divisors (see below), whose sum is σ = 1890527436. Its totient is φ = 891878400.

The previous prime is 1305645391. The next prime is 1305645427. The reversal of 1305645425 is 5245465031.

It can be written as a sum of positive squares in 6 ways, for example, as 64915249 + 1240730176 = 8057^2 + 35224^2 .

It is not a de Polignac number, because 1305645425 - 2¹² = 1305641329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1305645427) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 342329 + ... + 346121.

It is an arithmetic number, because the mean of its divisors is an integer number (52514651).

Almost surely, 2^1305645425 is an apocalyptic number.

It is an amenable number.

1305645425 is a deficient number, since it is larger than the sum of its proper divisors (584882011).

1305645425 is a wasteful number, since it uses less digits than its factorization.

1305645425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4098 (or 4086 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 1305645425 is about 36133.7159035713. The cubic root of 1305645425 is about 1092.9704418439.

The spelling of 1305645425 in words is "one billion, three hundred five million, six hundred forty-five thousand, four hundred twenty-five".