1228500111 has 4 divisors (see below), whose sum is σ = 1638000152. Its totient is φ = 819000072.

The previous prime is 1228500109. The next prime is 1228500113. The reversal of 1228500111 is 1110058221.

1228500111 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (1228500109) and next prime (1228500113).

It is not a de Polignac number, because 1228500111 - 2¹ = 1228500109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228500113) 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, 204750016 + ... + 204750021.

It is an arithmetic number, because the mean of its divisors is an integer number (409500038).

Almost surely, 2^1228500111 is an apocalyptic number.

1228500111 is a deficient number, since it is larger than the sum of its proper divisors (409500041).

1228500111 is an equidigital number, since it uses as much as digits as its factorization.

1228500111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409500040.

The product of its (nonzero) digits is 160, while the sum is 21.

The square root of 1228500111 is about 35049.9659200976. The cubic root of 1228500111 is about 1071.0055795448.

Adding to 1228500111 its reverse (1110058221), we get a palindrome (2338558332).

The spelling of 1228500111 in words is "one billion, two hundred twenty-eight million, five hundred thousand, one hundred eleven".