1220534545 has 4 divisors (see below), whose sum is σ = 1464641460. Its totient is φ = 976427632.

The previous prime is 1220534531. The next prime is 1220534561. The reversal of 1220534545 is 5454350221.

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 960938001 + 259596544 = 30999^2 + 16112^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220534545 - 2⁹ = 1220534033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122053450 + ... + 122053459.

It is an arithmetic number, because the mean of its divisors is an integer number (366160365).

Almost surely, 2^1220534545 is an apocalyptic number.

It is an amenable number.

1220534545 is a deficient number, since it is larger than the sum of its proper divisors (244106915).

1220534545 is an equidigital number, since it uses as much as digits as its factorization.

1220534545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244106914.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 1220534545 is about 34936.1495445620. The cubic root of 1220534545 is about 1068.6857667129.

Adding to 1220534545 its reverse (5454350221), we get a palindrome (6674884766).

The spelling of 1220534545 in words is "one billion, two hundred twenty million, five hundred thirty-four thousand, five hundred forty-five".