221540089 has 2 divisors, whose sum is σ = 221540090. Its totient is φ = 221540088.

The previous prime is 221540047. The next prime is 221540101. The reversal of 221540089 is 980045122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217267600 + 4272489 = 14740^2 + 2067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221540089 is a prime.

It is a super-2 number, since 2×221540089² = 98160022068255842, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221540089.

It is not a weakly prime, because it can be changed into another prime (221540009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110770044 + 110770045.

It is an arithmetic number, because the mean of its divisors is an integer number (110770045).

Almost surely, 2^221540089 is an apocalyptic number.

It is an amenable number.

221540089 is a deficient number, since it is larger than the sum of its proper divisors (1).

221540089 is an equidigital number, since it uses as much as digits as its factorization.

221540089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 221540089 is about 14884.2228214979. Note that the first 3 decimals coincide. The cubic root of 221540089 is about 605.0864698937.

The spelling of 221540089 in words is "two hundred twenty-one million, five hundred forty thousand, eighty-nine".