1220232313 has 4 divisors (see below), whose sum is σ = 1220324688. Its totient is φ = 1220139940.

The previous prime is 1220232311. The next prime is 1220232319. The reversal of 1220232313 is 3132320221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1220232313 - 2¹ = 1220232311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220232311) 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, 22231 + ... + 54172.

It is an arithmetic number, because the mean of its divisors is an integer number (305081172).

Almost surely, 2^1220232313 is an apocalyptic number.

It is an amenable number.

1220232313 is a deficient number, since it is larger than the sum of its proper divisors (92375).

1220232313 is an equidigital number, since it uses as much as digits as its factorization.

1220232313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92374.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1220232313 is about 34931.8237857688. The cubic root of 1220232313 is about 1068.5975491633.

Adding to 1220232313 its reverse (3132320221), we get a palindrome (4352552534).

The spelling of 1220232313 in words is "one billion, two hundred twenty million, two hundred thirty-two thousand, three hundred thirteen".