1216908963 has 6 divisors (see below), whose sum is σ = 1757757404. Its totient is φ = 811272636.

The previous prime is 1216908961. The next prime is 1216908971. The reversal of 1216908963 is 3698096121.

It is a happy number.

It is not a de Polignac number, because 1216908963 - 2¹ = 1216908961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216908961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67606045 + ... + 67606062.

Almost surely, 2^1216908963 is an apocalyptic number.

1216908963 is a deficient number, since it is larger than the sum of its proper divisors (540848441).

1216908963 is a wasteful number, since it uses less digits than its factorization.

1216908963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135212113 (or 135212110 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1216908963 is about 34884.2222645138. Note that the first 4 decimals coincide. The cubic root of 1216908963 is about 1067.6265448252.

The spelling of 1216908963 in words is "one billion, two hundred sixteen million, nine hundred eight thousand, nine hundred sixty-three".