1220243311 has 16 divisors (see below), whose sum is σ = 1471564800. Its totient is φ = 989195328.

The previous prime is 1220243309. The next prime is 1220243347. The reversal of 1220243311 is 1133420221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1220243311 - 2¹ = 1220243309 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 (1220243351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28251 + ... + 56908.

It is an arithmetic number, because the mean of its divisors is an integer number (91972800).

Almost surely, 2^1220243311 is an apocalyptic number.

1220243311 is a deficient number, since it is larger than the sum of its proper divisors (251321489).

1220243311 is an equidigital number, since it uses as much as digits as its factorization.

1220243311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85278.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1220243311 is about 34931.9812063387. The cubic root of 1220243311 is about 1068.6007595903.

Adding to 1220243311 its reverse (1133420221), we get a palindrome (2353663532).

The spelling of 1220243311 in words is "one billion, two hundred twenty million, two hundred forty-three thousand, three hundred eleven".