1220138545 has 8 divisors (see below), whose sum is σ = 1498216896. Its totient is φ = 953410416.

The previous prime is 1220138537. The next prime is 1220138581. The reversal of 1220138545 is 5458310221.

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 1220138545 - 2³ = 1220138537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2837317 + ... + 2837746.

It is an arithmetic number, because the mean of its divisors is an integer number (187277112).

Almost surely, 2^1220138545 is an apocalyptic number.

It is an amenable number.

1220138545 is a deficient number, since it is larger than the sum of its proper divisors (278078351).

1220138545 is an equidigital number, since it uses as much as digits as its factorization.

1220138545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5675111.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 1220138545 is about 34930.4816027492. The cubic root of 1220138545 is about 1068.5701765554.

Adding to 1220138545 its reverse (5458310221), we get a palindrome (6678448766).

The spelling of 1220138545 in words is "one billion, two hundred twenty million, one hundred thirty-eight thousand, five hundred forty-five".