1216917933 has 24 divisors (see below), whose sum is σ = 2038257984. Its totient is φ = 632163840.

The previous prime is 1216917907. The next prime is 1216917941. The reversal of 1216917933 is 3397196121.

It is not a de Polignac number, because 1216917933 - 2²¹ = 1214820781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216917943) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 236916 + ... + 241997.

It is an arithmetic number, because the mean of its divisors is an integer number (84927416).

Almost surely, 2^1216917933 is an apocalyptic number.

It is an amenable number.

1216917933 is a deficient number, since it is larger than the sum of its proper divisors (821340051).

1216917933 is a wasteful number, since it uses less digits than its factorization.

1216917933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478945 (or 478934 counting only the distinct ones).

The product of its digits is 61236, while the sum is 42.

The square root of 1216917933 is about 34884.3508324291. The cubic root of 1216917933 is about 1067.6291680252.

The spelling of 1216917933 in words is "one billion, two hundred sixteen million, nine hundred seventeen thousand, nine hundred thirty-three".