1220303243 has 4 divisors (see below), whose sum is σ = 1221112368. Its totient is φ = 1219494120.

The previous prime is 1220303239. The next prime is 1220303261. The reversal of 1220303243 is 3423030221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220303243 - 2² = 1220303239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220303263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402296 + ... + 405317.

It is an arithmetic number, because the mean of its divisors is an integer number (305278092).

Almost surely, 2^1220303243 is an apocalyptic number.

1220303243 is a deficient number, since it is larger than the sum of its proper divisors (809125).

1220303243 is an equidigital number, since it uses as much as digits as its factorization.

1220303243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809124.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 1220303243 is about 34932.8390343528. The cubic root of 1220303243 is about 1068.6182540063.

Adding to 1220303243 its reverse (3423030221), we get a palindrome (4643333464).

The spelling of 1220303243 in words is "one billion, two hundred twenty million, three hundred three thousand, two hundred forty-three".