1220553543 has 16 divisors (see below), whose sum is σ = 1778564736. Its totient is φ = 738390240.

The previous prime is 1220553541. The next prime is 1220553547. The reversal of 1220553543 is 3453550221.

It is not a de Polignac number, because 1220553543 - 2¹ = 1220553541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220553543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220553541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14821 + ... + 51582.

It is an arithmetic number, because the mean of its divisors is an integer number (111160296).

Almost surely, 2^1220553543 is an apocalyptic number.

1220553543 is a deficient number, since it is larger than the sum of its proper divisors (558011193).

1220553543 is a wasteful number, since it uses less digits than its factorization.

1220553543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66974.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 1220553543 is about 34936.4214395235. The cubic root of 1220553543 is about 1068.6913114929.

The spelling of 1220553543 in words is "one billion, two hundred twenty million, five hundred fifty-three thousand, five hundred forty-three".