1220129345 has 8 divisors (see below), whose sum is σ = 1469853864. Its totient is φ = 972304384.

The previous prime is 1220129333. The next prime is 1220129363. The reversal of 1220129345 is 5439210221.

It can be written as a sum of positive squares in 4 ways, for example, as 880427584 + 339701761 = 29672^2 + 18431^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220129345 - 2⁴ = 1220129329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473474 + ... + 476043.

It is an arithmetic number, because the mean of its divisors is an integer number (183731733).

Almost surely, 2^1220129345 is an apocalyptic number.

It is an amenable number.

1220129345 is a deficient number, since it is larger than the sum of its proper divisors (249724519).

1220129345 is an equidigital number, since it uses as much as digits as its factorization.

1220129345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949779.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1220129345 is about 34930.3499123613. The cubic root of 1220129345 is about 1068.5674908303.

Adding to 1220129345 its reverse (5439210221), we get a palindrome (6659339566).

The spelling of 1220129345 in words is "one billion, two hundred twenty million, one hundred twenty-nine thousand, three hundred forty-five".