1220140655 has 4 divisors (see below), whose sum is σ = 1464168792. Its totient is φ = 976112520.

The previous prime is 1220140637. The next prime is 1220140667. The reversal of 1220140655 is 5560410221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5560410221 = 7151 ⋅777571.

It is not a de Polignac number, because 1220140655 - 2¹⁴ = 1220124271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122014061 + ... + 122014070.

It is an arithmetic number, because the mean of its divisors is an integer number (366042198).

Almost surely, 2^1220140655 is an apocalyptic number.

1220140655 is a deficient number, since it is larger than the sum of its proper divisors (244028137).

1220140655 is an equidigital number, since it uses as much as digits as its factorization.

1220140655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244028136.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1220140655 is about 34930.5118055834. The cubic root of 1220140655 is about 1068.5707925187.

Adding to 1220140655 its reverse (5560410221), we get a palindrome (6780550876).

The spelling of 1220140655 in words is "one billion, two hundred twenty million, one hundred forty thousand, six hundred fifty-five".