221001589 has 2 divisors, whose sum is σ = 221001590. Its totient is φ = 221001588.

The previous prime is 221001541. The next prime is 221001593. The reversal of 221001589 is 985100122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132020100 + 88981489 = 11490^2 + 9433^2 .

It is a cyclic number.

It is not a de Polignac number, because 221001589 - 2⁷ = 221001461 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 (221001509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500794 + 110500795.

It is an arithmetic number, because the mean of its divisors is an integer number (110500795).

Almost surely, 2^221001589 is an apocalyptic number.

It is an amenable number.

221001589 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001589 is an equidigital number, since it uses as much as digits as its factorization.

221001589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 221001589 is about 14866.1221910759. The cubic root of 221001589 is about 604.5958086180.

The spelling of 221001589 in words is "two hundred twenty-one million, one thousand, five hundred eighty-nine".