1216711671 has 32 divisors (see below), whose sum is σ = 1870848000. Its totient is φ = 688992480.

The previous prime is 1216711669. The next prime is 1216711679. The reversal of 1216711671 is 1761176121.

1216711671 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1216711671 - 2¹ = 1216711669 is a prime.

It is a super-2 number, since 2×1216711671² = 2960774580695224482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216711679) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1499856 + ... + 1500666.

It is an arithmetic number, because the mean of its divisors is an integer number (58464000).

Almost surely, 2^1216711671 is an apocalyptic number.

1216711671 is a deficient number, since it is larger than the sum of its proper divisors (654136329).

1216711671 is a wasteful number, since it uses less digits than its factorization.

1216711671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379.

The product of its digits is 3528, while the sum is 33.

The square root of 1216711671 is about 34881.3943385295. The cubic root of 1216711671 is about 1067.5688452035.

Adding to 1216711671 its reverse (1761176121), we get a palindrome (2977887792).

The spelling of 1216711671 in words is "one billion, two hundred sixteen million, seven hundred eleven thousand, six hundred seventy-one".