1220111145 has 48 divisors (see below), whose sum is σ = 2350700352. Its totient is φ = 580394880.

The previous prime is 1220111143. The next prime is 1220111159. The reversal of 1220111145 is 5411110221.

It is not a de Polignac number, because 1220111145 - 2¹ = 1220111143 is a prime.

It is a super-2 number, since 2×1220111145² = 2977342412306422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220111141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2982 + ... + 49488.

It is an arithmetic number, because the mean of its divisors is an integer number (48972924).

Almost surely, 2^1220111145 is an apocalyptic number.

1220111145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220111145 is a deficient number, since it is larger than the sum of its proper divisors (1130589207).

1220111145 is a wasteful number, since it uses less digits than its factorization.

1220111145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46582 (or 46579 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1220111145 is about 34930.0893929575. The cubic root of 1220111145 is about 1068.5621777255.

Adding to 1220111145 its reverse (5411110221), we get a palindrome (6631221366).

The spelling of 1220111145 in words is "one billion, two hundred twenty million, one hundred eleven thousand, one hundred forty-five".