1220344129 has 4 divisors (see below), whose sum is σ = 1220693076. Its totient is φ = 1219995184.

The previous prime is 1220344117. The next prime is 1220344159. The reversal of 1220344129 is 9214430221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 490533904 + 729810225 = 22148^2 + 27015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220344129 - 2²¹ = 1218246977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220344097 and 1220344106.

It is not an unprimeable number, because it can be changed into a prime (1220344159) 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, 169174 + ... + 176239.

It is an arithmetic number, because the mean of its divisors is an integer number (305173269).

Almost surely, 2^1220344129 is an apocalyptic number.

It is an amenable number.

1220344129 is a deficient number, since it is larger than the sum of its proper divisors (348947).

1220344129 is an equidigital number, since it uses as much as digits as its factorization.

1220344129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348946.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1220344129 is about 34933.4242381133. The cubic root of 1220344129 is about 1068.6301884819.

The spelling of 1220344129 in words is "one billion, two hundred twenty million, three hundred forty-four thousand, one hundred twenty-nine".