1220240311 has 4 divisors (see below), whose sum is σ = 1224880272. Its totient is φ = 1215600352.

The previous prime is 1220240303. The next prime is 1220240327. The reversal of 1220240311 is 1130420221.

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 1220240311 - 2³ = 1220240303 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 (1220240341) 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, 2319586 + ... + 2320111.

It is an arithmetic number, because the mean of its divisors is an integer number (306220068).

Almost surely, 2^1220240311 is an apocalyptic number.

1220240311 is a deficient number, since it is larger than the sum of its proper divisors (4639961).

1220240311 is an equidigital number, since it uses as much as digits as its factorization.

1220240311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4639960.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220240311 is about 34931.9382657190. The cubic root of 1220240311 is about 1068.5998838620.

Adding to 1220240311 its reverse (1130420221), we get a palindrome (2350660532).

The spelling of 1220240311 in words is "one billion, two hundred twenty million, two hundred forty thousand, three hundred eleven".