1220305297 has 12 divisors (see below), whose sum is σ = 1304632576. Its totient is φ = 1140194160.

The previous prime is 1220305279. The next prime is 1220305327. The reversal of 1220305297 is 7925030221.

It is a de Polignac number, because none of the positive numbers 2^k-1220305297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220305397) 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 11 ways as a sum of consecutive naturals, for example, 2668 + ... + 49474.

Almost surely, 2^1220305297 is an apocalyptic number.

It is an amenable number.

1220305297 is a deficient number, since it is larger than the sum of its proper divisors (84327279).

1220305297 is an equidigital number, since it uses as much as digits as its factorization.

1220305297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46896 (or 46867 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1220305297 is about 34932.8684336113. The cubic root of 1220305297 is about 1068.6188535678.

The spelling of 1220305297 in words is "one billion, two hundred twenty million, three hundred five thousand, two hundred ninety-seven".