1255122111 has 4 divisors (see below), whose sum is σ = 1673496152. Its totient is φ = 836748072.

The previous prime is 1255122109. The next prime is 1255122133. The reversal of 1255122111 is 1112215521.

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

It is not a de Polignac number, because 1255122111 - 2¹ = 1255122109 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 (1255122101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209187016 + ... + 209187021.

It is an arithmetic number, because the mean of its divisors is an integer number (418374038).

Almost surely, 2^1255122111 is an apocalyptic number.

1255122111 is a deficient number, since it is larger than the sum of its proper divisors (418374041).

1255122111 is an equidigital number, since it uses as much as digits as its factorization.

1255122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418374040.

The product of its digits is 200, while the sum is 21.

The square root of 1255122111 is about 35427.7025927451. The cubic root of 1255122111 is about 1078.6867069937.

Adding to 1255122111 its reverse (1112215521), we get a palindrome (2367337632).

The spelling of 1255122111 in words is "one billion, two hundred fifty-five million, one hundred twenty-two thousand, one hundred eleven".