1217632685 has 4 divisors (see below), whose sum is σ = 1461159228. Its totient is φ = 974106144.

The previous prime is 1217632631. The next prime is 1217632697. The reversal of 1217632685 is 5862367121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 205692964 + 1011939721 = 14342^2 + 31811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217632685 - 2⁶ = 1217632621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121763264 + ... + 121763273.

It is an arithmetic number, because the mean of its divisors is an integer number (365289807).

Almost surely, 2^1217632685 is an apocalyptic number.

It is an amenable number.

1217632685 is a deficient number, since it is larger than the sum of its proper divisors (243526543).

1217632685 is an equidigital number, since it uses as much as digits as its factorization.

1217632685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243526542.

The product of its digits is 120960, while the sum is 41.

The square root of 1217632685 is about 34894.5939222682. The cubic root of 1217632685 is about 1067.8381497244.

The spelling of 1217632685 in words is "one billion, two hundred seventeen million, six hundred thirty-two thousand, six hundred eighty-five".