1216971245 has 8 divisors (see below), whose sum is σ = 1668989184. Its totient is φ = 834494544.

The previous prime is 1216971227. The next prime is 1216971253. The reversal of 1216971245 is 5421796121.

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 1216971245 - 2¹⁰ = 1216970221 is a prime.

It is a super-2 number, since 2×1216971245² = 2962038022313700050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216971199 and 1216971208.

It is a congruent number.

It is an unprimeable number.

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, 17385269 + ... + 17385338.

It is an arithmetic number, because the mean of its divisors is an integer number (208623648).

Almost surely, 2^1216971245 is an apocalyptic number.

It is an amenable number.

1216971245 is a deficient number, since it is larger than the sum of its proper divisors (452017939).

1216971245 is an equidigital number, since it uses as much as digits as its factorization.

1216971245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34770619.

The product of its digits is 30240, while the sum is 38.

The square root of 1216971245 is about 34885.1149489291. The cubic root of 1216971245 is about 1067.6447583986.

The spelling of 1216971245 in words is "one billion, two hundred sixteen million, nine hundred seventy-one thousand, two hundred forty-five".