1216571139839 has 32 divisors (see below), whose sum is σ = 1359747689472. Its totient is φ = 1078980784000.

The previous prime is 1216571139803. The next prime is 1216571139841. The reversal of 1216571139839 is 9389311756121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1216571139839 - 2¹² = 1216571135743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216591139839) 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, 269329409 + ... + 269333925.

It is an arithmetic number, because the mean of its divisors is an integer number (42492115296).

Almost surely, 2^{1216571139839} is an apocalyptic number.

1216571139839 is a deficient number, since it is larger than the sum of its proper divisors (143176549633).

1216571139839 is a wasteful number, since it uses less digits than its factorization.

1216571139839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6127.

The product of its digits is 2449440, while the sum is 56.

The spelling of 1216571139839 in words is "one trillion, two hundred sixteen billion, five hundred seventy-one million, one hundred thirty-nine thousand, eight hundred thirty-nine".