1220601309 has 16 divisors (see below), whose sum is σ = 1726057152. Its totient is φ = 764598528.

The previous prime is 1220601259. The next prime is 1220601341. The reversal of 1220601309 is 9031060221.

It is a de Polignac number, because none of the positive numbers 2^k-1220601309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220603309) 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, 11742 + ... + 50784.

It is an arithmetic number, because the mean of its divisors is an integer number (107878572).

Almost surely, 2^1220601309 is an apocalyptic number.

It is an amenable number.

1220601309 is a deficient number, since it is larger than the sum of its proper divisors (505455843).

1220601309 is a wasteful number, since it uses less digits than its factorization.

1220601309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39676.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1220601309 is about 34937.1050460681. The cubic root of 1220601309 is about 1068.7052522833.

The spelling of 1220601309 in words is "one billion, two hundred twenty million, six hundred one thousand, three hundred nine".