1220311142 has 4 divisors (see below), whose sum is σ = 1830466716. Its totient is φ = 610155570.

The previous prime is 1220311121. The next prime is 1220311159. The reversal of 1220311142 is 2411130221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2411130221 = 47 ⋅51300643.

It is a self number, because there is not a number n which added to its sum of digits gives 1220311142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305077784 + ... + 305077787.

It is an arithmetic number, because the mean of its divisors is an integer number (457616679).

Almost surely, 2^1220311142 is an apocalyptic number.

1220311142 is a deficient number, since it is larger than the sum of its proper divisors (610155574).

1220311142 is an equidigital number, since it uses as much as digits as its factorization.

1220311142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610155573.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1220311142 is about 34932.9520939757. The cubic root of 1220311142 is about 1068.6205597166.

Adding to 1220311142 its reverse (2411130221), we get a palindrome (3631441363).

The spelling of 1220311142 in words is "one billion, two hundred twenty million, three hundred eleven thousand, one hundred forty-two".