1216540683 has 24 divisors (see below), whose sum is σ = 1863248400. Its totient is φ = 762718464.

The previous prime is 1216540669. The next prime is 1216540709. The reversal of 1216540683 is 3860456121.

It is a happy number.

1216540683 is a `hidden beast` number, since 12 + 165 + 406 + 83 = 666.

It is not a de Polignac number, because 1216540683 - 2⁴ = 1216540667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216540603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2538 + ... + 49391.

It is an arithmetic number, because the mean of its divisors is an integer number (77635350).

Almost surely, 2^1216540683 is an apocalyptic number.

1216540683 is a deficient number, since it is larger than the sum of its proper divisors (646707717).

1216540683 is a wasteful number, since it uses less digits than its factorization.

1216540683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52091 (or 52088 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1216540683 is about 34878.9432609418. The cubic root of 1216540683 is about 1067.5188333512.

The spelling of 1216540683 in words is "one billion, two hundred sixteen million, five hundred forty thousand, six hundred eighty-three".