122111555 has 4 divisors (see below), whose sum is σ = 146533872. Its totient is φ = 97689240.

The previous prime is 122111491. The next prime is 122111579. The reversal of 122111555 is 555111221.

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

It is not a de Polignac number, because 122111555 - 2⁶ = 122111491 is a prime.

It is a super-2 number, since 2×122111555² = 29822463729036050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122111555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12211151 + ... + 12211160.

It is an arithmetic number, because the mean of its divisors is an integer number (36633468).

Almost surely, 2^122111555 is an apocalyptic number.

122111555 is a deficient number, since it is larger than the sum of its proper divisors (24422317).

122111555 is an equidigital number, since it uses as much as digits as its factorization.

122111555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24422316.

The product of its digits is 500, while the sum is 23.

The square root of 122111555 is about 11050.4097209108. The cubic root of 122111555 is about 496.1186888073.

Adding to 122111555 its reverse (555111221), we get a palindrome (677222776).

The spelling of 122111555 in words is "one hundred twenty-two million, one hundred eleven thousand, five hundred fifty-five".