1217025505 has 8 divisors (see below), whose sum is σ = 1463055912. Its totient is φ = 971870208.

The previous prime is 1217025503. The next prime is 1217025521. The reversal of 1217025505 is 5055207121.

It can be written as a sum of positive squares in 4 ways, for example, as 59120721 + 1157904784 = 7689^2 + 34028^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1217025505 - 2¹ = 1217025503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217025503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215712 + ... + 221281.

It is an arithmetic number, because the mean of its divisors is an integer number (182881989).

Almost surely, 2^1217025505 is an apocalyptic number.

It is an amenable number.

1217025505 is a deficient number, since it is larger than the sum of its proper divisors (246030407).

1217025505 is an equidigital number, since it uses as much as digits as its factorization.

1217025505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437555.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 1217025505 is about 34885.8926358492. The cubic root of 1217025505 is about 1067.6606255343.

It can be divided in two parts, 12170 and 25505, that added together give a triangular number (37675 = T₂₇₄).

The spelling of 1217025505 in words is "one billion, two hundred seventeen million, twenty-five thousand, five hundred five".