1055543221 has 2 divisors, whose sum is σ = 1055543222. Its totient is φ = 1055543220.

The previous prime is 1055543219. The next prime is 1055543227. The reversal of 1055543221 is 1223455501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055535121 + 8100 = 32489^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055543221 - 2¹ = 1055543219 is a prime.

It is a super-3 number, since 3×1055543221³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1055543219, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1055543221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1055543227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527771610 + 527771611.

It is an arithmetic number, because the mean of its divisors is an integer number (527771611).

Almost surely, 2^1055543221 is an apocalyptic number.

It is an amenable number.

1055543221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055543221 is an equidigital number, since it uses as much as digits as its factorization.

1055543221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1055543221 is about 32489.1246573373. The cubic root of 1055543221 is about 1018.1818247408.

Adding to 1055543221 its reverse (1223455501), we get a palindrome (2278998722).

The spelling of 1055543221 in words is "one billion, fifty-five million, five hundred forty-three thousand, two hundred twenty-one".