221157589 has 2 divisors, whose sum is σ = 221157590. Its totient is φ = 221157588.

The previous prime is 221157529. The next prime is 221157617. The reversal of 221157589 is 985751122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129572689 + 91584900 = 11383^2 + 9570^2 .

It is a cyclic number.

It is not a de Polignac number, because 221157589 - 2¹⁵ = 221124821 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 (221157529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110578794 + 110578795.

It is an arithmetic number, because the mean of its divisors is an integer number (110578795).

Almost surely, 2^221157589 is an apocalyptic number.

It is an amenable number.

221157589 is a deficient number, since it is larger than the sum of its proper divisors (1).

221157589 is an equidigital number, since it uses as much as digits as its factorization.

221157589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 40.

The square root of 221157589 is about 14871.3680944290. The cubic root of 221157589 is about 604.7380319737.

The spelling of 221157589 in words is "two hundred twenty-one million, one hundred fifty-seven thousand, five hundred eighty-nine".