1220533111 has 12 divisors (see below), whose sum is σ = 1481535792. Its totient is φ = 1000684608.

The previous prime is 1220533099. The next prime is 1220533117. The reversal of 1220533111 is 1113350221.

It is not a de Polignac number, because 1220533111 - 2⁷ = 1220532983 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 (1220533117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540370 + ... + 542623.

It is an arithmetic number, because the mean of its divisors is an integer number (123461316).

Almost surely, 2^1220533111 is an apocalyptic number.

1220533111 is a deficient number, since it is larger than the sum of its proper divisors (261002681).

1220533111 is a wasteful number, since it uses less digits than its factorization.

1220533111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083030 (or 1083023 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1220533111 is about 34936.1290214013. The cubic root of 1220533111 is about 1068.6853481815.

Adding to 1220533111 its reverse (1113350221), we get a palindrome (2333883332).

The spelling of 1220533111 in words is "one billion, two hundred twenty million, five hundred thirty-three thousand, one hundred eleven".