1216220963 has 4 divisors (see below), whose sum is σ = 1217251968. Its totient is φ = 1215189960.

The previous prime is 1216220939. The next prime is 1216221001. The reversal of 1216220963 is 3690226121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1216220963 - 2¹⁴ = 1216204579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216220063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513731 + ... + 516092.

It is an arithmetic number, because the mean of its divisors is an integer number (304312992).

Almost surely, 2^1216220963 is an apocalyptic number.

1216220963 is a deficient number, since it is larger than the sum of its proper divisors (1031005).

1216220963 is a wasteful number, since it uses less digits than its factorization.

1216220963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031004.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1216220963 is about 34874.3596787095. The cubic root of 1216220963 is about 1067.4253066734.

The spelling of 1216220963 in words is "one billion, two hundred sixteen million, two hundred twenty thousand, nine hundred sixty-three".