1305215505 has 48 divisors (see below), whose sum is σ = 2550535680. Its totient is φ = 632823840.

The previous prime is 1305215503. The next prime is 1305215531. The reversal of 1305215505 is 5055125031.

1305215505 is a `hidden beast` number, since 130 + 5 + 21 + 5 + 505 = 666.

It is not a de Polignac number, because 1305215505 - 2¹ = 1305215503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1305215501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23617 + ... + 56286.

It is an arithmetic number, because the mean of its divisors is an integer number (53136160).

Almost surely, 2^1305215505 is an apocalyptic number.

1305215505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1305215505 is a deficient number, since it is larger than the sum of its proper divisors (1245320175).

1305215505 is a wasteful number, since it uses less digits than its factorization.

1305215505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79939 (or 79922 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 1305215505 is about 36127.7663992669. The cubic root of 1305215505 is about 1092.8504650550.

The spelling of 1305215505 in words is "one billion, three hundred five million, two hundred fifteen thousand, five hundred five".