1216016051 has 4 divisors (see below), whose sum is σ = 1216087704. Its totient is φ = 1215944400.

The previous prime is 1216016041. The next prime is 1216016129. The reversal of 1216016051 is 1506106121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1216016051 - 2¹⁸ = 1215753907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216016041) 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, 5591 + ... + 49631.

It is an arithmetic number, because the mean of its divisors is an integer number (304021926).

Almost surely, 2^1216016051 is an apocalyptic number.

1216016051 is a deficient number, since it is larger than the sum of its proper divisors (71653).

1216016051 is an equidigital number, since it uses as much as digits as its factorization.

1216016051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71652.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1216016051 is about 34871.4216945624. The cubic root of 1216016051 is about 1067.3653557965.

The spelling of 1216016051 in words is "one billion, two hundred sixteen million, sixteen thousand, fifty-one".