1217925585 has 32 divisors (see below), whose sum is σ = 2169290880. Its totient is φ = 648333504.

The previous prime is 1217925563. The next prime is 1217925587. The reversal of 1217925585 is 5855297121.

1217925585 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 92 + 558 + 5 = 666.

It is not a de Polignac number, because 1217925585 - 2¹⁵ = 1217892817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1217925585.

It is not an unprimeable number, because it can be changed into a prime (1217925587) 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 31 ways as a sum of consecutive naturals, for example, 65599 + ... + 82091.

It is an arithmetic number, because the mean of its divisors is an integer number (67790340).

Almost surely, 2^1217925585 is an apocalyptic number.

1217925585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1217925585 is a deficient number, since it is larger than the sum of its proper divisors (951365295).

1217925585 is a wasteful number, since it uses less digits than its factorization.

1217925585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17054 (or 17048 counting only the distinct ones).

The product of its digits is 252000, while the sum is 45.

The square root of 1217925585 is about 34898.7905950908. The cubic root of 1217925585 is about 1067.9237652313.

The spelling of 1217925585 in words is "one billion, two hundred seventeen million, nine hundred twenty-five thousand, five hundred eighty-five".