111212145 has 48 divisors (see below), whose sum is σ = 211536000. Its totient is φ = 53602560.

The previous prime is 111212141. The next prime is 111212173. The reversal of 111212145 is 541212111.

It is not a de Polignac number, because 111212145 - 2² = 111212141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111212141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97941 + ... + 99069.

It is an arithmetic number, because the mean of its divisors is an integer number (4407000).

Almost surely, 2^111212145 is an apocalyptic number.

111212145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

111212145 is a deficient number, since it is larger than the sum of its proper divisors (100323855).

111212145 is a wasteful number, since it uses less digits than its factorization.

111212145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350 (or 1347 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 111212145 is about 10545.7169030844. The cubic root of 111212145 is about 480.8955287075.

Adding to 111212145 its reverse (541212111), we get a palindrome (652424256).

The spelling of 111212145 in words is "one hundred eleven million, two hundred twelve thousand, one hundred forty-five".