1220601611 has 4 divisors (see below), whose sum is σ = 1250372424. Its totient is φ = 1190830800.

The previous prime is 1220601601. The next prime is 1220601623. The reversal of 1220601611 is 1161060221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220601611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220601601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14885345 + ... + 14885426.

It is an arithmetic number, because the mean of its divisors is an integer number (312593106).

Almost surely, 2^1220601611 is an apocalyptic number.

1220601611 is a deficient number, since it is larger than the sum of its proper divisors (29770813).

1220601611 is an equidigital number, since it uses as much as digits as its factorization.

1220601611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29770812.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1220601611 is about 34937.1093681203. The cubic root of 1220601611 is about 1068.7053404226.

Adding to 1220601611 its reverse (1161060221), we get a palindrome (2381661832).

The spelling of 1220601611 in words is "one billion, two hundred twenty million, six hundred one thousand, six hundred eleven".