1217018216 has 8 divisors (see below), whose sum is σ = 2281909170. Its totient is φ = 608509104.

The previous prime is 1217018197. The next prime is 1217018221. The reversal of 1217018216 is 6128107121.

It can be written as a sum of positive squares in only one way, i.e., 1111955716 + 105062500 = 33346^2 + 10250^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1217018216² = 2962266676151645312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76063631 + ... + 76063646.

Almost surely, 2^1217018216 is an apocalyptic number.

It is an amenable number.

1217018216 is a deficient number, since it is larger than the sum of its proper divisors (1064890954).

1217018216 is a wasteful number, since it uses less digits than its factorization.

1217018216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152127283 (or 152127279 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 1217018216 is about 34885.7881665299. The cubic root of 1217018216 is about 1067.6584940550.

The spelling of 1217018216 in words is "one billion, two hundred seventeen million, eighteen thousand, two hundred sixteen".