1225440111 has 16 divisors (see below), whose sum is σ = 1917807104. Its totient is φ = 681325344.

The previous prime is 1225440109. The next prime is 1225440127. The reversal of 1225440111 is 1110445221.

It is not a de Polignac number, because 1225440111 - 2¹ = 1225440109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225480111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 787795 + ... + 789348.

It is an arithmetic number, because the mean of its divisors is an integer number (119862944).

Almost surely, 2^1225440111 is an apocalyptic number.

1225440111 is a deficient number, since it is larger than the sum of its proper divisors (692366993).

1225440111 is a wasteful number, since it uses less digits than its factorization.

1225440111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577190.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1225440111 is about 35006.2867353851. The cubic root of 1225440111 is about 1070.1156048850.

Adding to 1225440111 its reverse (1110445221), we get a palindrome (2335885332).

The spelling of 1225440111 in words is "one billion, two hundred twenty-five million, four hundred forty thousand, one hundred eleven".