1220312113 has 4 divisors (see below), whose sum is σ = 1220677488. Its totient is φ = 1219946740.

The previous prime is 1220312111. The next prime is 1220312129. The reversal of 1220312113 is 3112130221.

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.

It is a cyclic number.

It is not a de Polignac number, because 1220312113 - 2¹ = 1220312111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220312111) 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, 177631 + ... + 184372.

It is an arithmetic number, because the mean of its divisors is an integer number (305169372).

Almost surely, 2^1220312113 is an apocalyptic number.

It is an amenable number.

1220312113 is a deficient number, since it is larger than the sum of its proper divisors (365375).

1220312113 is an equidigital number, since it uses as much as digits as its factorization.

1220312113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365374.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1220312113 is about 34932.9659920254. The cubic root of 1220312113 is about 1068.6208431499.

Adding to 1220312113 its reverse (3112130221), we get a palindrome (4332442334).

The spelling of 1220312113 in words is "one billion, two hundred twenty million, three hundred twelve thousand, one hundred thirteen".