221552543 has 2 divisors, whose sum is σ = 221552544. Its totient is φ = 221552542.

The previous prime is 221552519. The next prime is 221552557. The reversal of 221552543 is 345255122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221552543 - 2²⁴ = 204775327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221552503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110776271 + 110776272.

It is an arithmetic number, because the mean of its divisors is an integer number (110776272).

Almost surely, 2^221552543 is an apocalyptic number.

221552543 is a deficient number, since it is larger than the sum of its proper divisors (1).

221552543 is an equidigital number, since it uses as much as digits as its factorization.

221552543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 29.

The square root of 221552543 is about 14884.6411780735. The cubic root of 221552543 is about 605.0978081060.

The spelling of 221552543 in words is "two hundred twenty-one million, five hundred fifty-two thousand, five hundred forty-three".