1220713311 has 8 divisors (see below), whose sum is σ = 1713281920. Its totient is φ = 770976792.

The previous prime is 1220713309. The next prime is 1220713313. The reversal of 1220713311 is 1133170221.

It is a happy number.

1220713311 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1220713309) and next prime (1220713313).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220713311 - 2¹ = 1220713309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220713313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10707955 + ... + 10708068.

It is an arithmetic number, because the mean of its divisors is an integer number (214160240).

Almost surely, 2^1220713311 is an apocalyptic number.

1220713311 is a deficient number, since it is larger than the sum of its proper divisors (492568609).

1220713311 is a wasteful number, since it uses less digits than its factorization.

1220713311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21416045.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 1220713311 is about 34938.7079182960. The cubic root of 1220713311 is about 1068.7379393051.

Adding to 1220713311 its reverse (1133170221), we get a palindrome (2353883532).

The spelling of 1220713311 in words is "one billion, two hundred twenty million, seven hundred thirteen thousand, three hundred eleven".