1220745111 has 16 divisors (see below), whose sum is σ = 1724859360. Its totient is φ = 766599680.

The previous prime is 1220745109. The next prime is 1220745133. The reversal of 1220745111 is 1115470221.

It is a cyclic number.

It is not a de Polignac number, because 1220745111 - 2¹ = 1220745109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220745101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167550 + ... + 174683.

It is an arithmetic number, because the mean of its divisors is an integer number (107803710).

Almost surely, 2^1220745111 is an apocalyptic number.

1220745111 is a deficient number, since it is larger than the sum of its proper divisors (504114249).

1220745111 is a wasteful number, since it uses less digits than its factorization.

1220745111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342306.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 1220745111 is about 34939.1629979884. The cubic root of 1220745111 is about 1068.7472195543.

The spelling of 1220745111 in words is "one billion, two hundred twenty million, seven hundred forty-five thousand, one hundred eleven".