1220061605 has 16 divisors (see below), whose sum is σ = 1679460480. Its totient is φ = 833497152.

The previous prime is 1220061599. The next prime is 1220061607. The reversal of 1220061605 is 5061600221.

It is a cyclic number.

It is not a de Polignac number, because 1220061605 - 2⁴ = 1220061589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220061607) 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, 55379 + ... + 74208.

It is an arithmetic number, because the mean of its divisors is an integer number (104966280).

Almost surely, 2^1220061605 is an apocalyptic number.

It is an amenable number.

1220061605 is a deficient number, since it is larger than the sum of its proper divisors (459398875).

1220061605 is a wasteful number, since it uses less digits than its factorization.

1220061605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129868.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1220061605 is about 34929.3802550231. The cubic root of 1220061605 is about 1068.5477153035.

Adding to 1220061605 its reverse (5061600221), we get a palindrome (6281661826).

The spelling of 1220061605 in words is "one billion, two hundred twenty million, sixty-one thousand, six hundred five".