1220650605 has 12 divisors (see below), whose sum is σ = 2115794460. Its totient is φ = 651013632.

The previous prime is 1220650597. The next prime is 1220650621. The reversal of 1220650605 is 5060560221.

1220650605 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 6 + 50 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 691742601 + 528908004 = 26301^2 + 22998^2 .

It is not a de Polignac number, because 1220650605 - 2³ = 1220650597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13562740 + ... + 13562829.

It is an arithmetic number, because the mean of its divisors is an integer number (176316205).

Almost surely, 2^1220650605 is an apocalyptic number.

1220650605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220650605 is a deficient number, since it is larger than the sum of its proper divisors (895143855).

1220650605 is a wasteful number, since it uses less digits than its factorization.

1220650605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27125580 (or 27125577 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1220650605 is about 34937.8105352926. The cubic root of 1220650605 is about 1068.7196392319.

The spelling of 1220650605 in words is "one billion, two hundred twenty million, six hundred fifty thousand, six hundred five".