1216216051 has 8 divisors (see below), whose sum is σ = 1222524144. Its totient is φ = 1209922560.

The previous prime is 1216216033. The next prime is 1216216063. The reversal of 1216216051 is 1506126121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1216216051 - 2¹¹ = 1216214003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216216031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188755 + ... + 195091.

It is an arithmetic number, because the mean of its divisors is an integer number (152815518).

Almost surely, 2^1216216051 is an apocalyptic number.

1216216051 is a deficient number, since it is larger than the sum of its proper divisors (6308093).

1216216051 is an equidigital number, since it uses as much as digits as its factorization.

1216216051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7301.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1216216051 is about 34874.2892544063. The cubic root of 1216216051 is about 1067.4238696537.

The spelling of 1216216051 in words is "one billion, two hundred sixteen million, two hundred sixteen thousand, fifty-one".