1228210155 has 16 divisors (see below), whose sum is σ = 2183484960. Its totient is φ = 655045344.

The previous prime is 1228210121. The next prime is 1228210163. The reversal of 1228210155 is 5510128221.

It is a happy number.

1228210155 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1228210155 - 2¹³ = 1228201963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4548792 + ... + 4549061.

It is an arithmetic number, because the mean of its divisors is an integer number (136467810).

Almost surely, 2^1228210155 is an apocalyptic number.

1228210155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1228210155 is a deficient number, since it is larger than the sum of its proper divisors (955274805).

1228210155 is an equidigital number, since it uses as much as digits as its factorization.

1228210155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9097867 (or 9097861 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 1228210155 is about 35045.8293524351. The cubic root of 1228210155 is about 1070.9213117654.

Adding to 1228210155 its reverse (5510128221), we get a palindrome (6738338376).

The spelling of 1228210155 in words is "one billion, two hundred twenty-eight million, two hundred ten thousand, one hundred fifty-five".