111216051 has 8 divisors (see below), whose sum is σ = 164764560. Its totient is φ = 74144016.

The previous prime is 111216031. The next prime is 111216071. The reversal of 111216051 is 150612111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111216031) and next prime (111216071).

It is not a de Polignac number, because 111216051 - 2⁵ = 111216019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111216031) 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, 2059530 + ... + 2059583.

It is an arithmetic number, because the mean of its divisors is an integer number (20595570).

Almost surely, 2^111216051 is an apocalyptic number.

111216051 is a deficient number, since it is larger than the sum of its proper divisors (53548509).

111216051 is an equidigital number, since it uses as much as digits as its factorization.

111216051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4119122 (or 4119116 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

The square root of 111216051 is about 10545.9020951268. The cubic root of 111216051 is about 480.9011586560.

Adding to 111216051 its reverse (150612111), we get a palindrome (261828162).

The spelling of 111216051 in words is "one hundred eleven million, two hundred sixteen thousand, fifty-one".