221272589 has 2 divisors, whose sum is σ = 221272590. Its totient is φ = 221272588.

The previous prime is 221272577. The next prime is 221272591. The reversal of 221272589 is 985272122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194128489 + 27144100 = 13933^2 + 5210^2 .

It is a cyclic number.

It is not a de Polignac number, because 221272589 - 2⁴ = 221272573 is a prime.

Together with 221272591, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12188765 and since 221272589 and 12188765 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221272549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110636294 + 110636295.

It is an arithmetic number, because the mean of its divisors is an integer number (110636295).

Almost surely, 2^221272589 is an apocalyptic number.

It is an amenable number.

221272589 is a deficient number, since it is larger than the sum of its proper divisors (1).

221272589 is an equidigital number, since it uses as much as digits as its factorization.

221272589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 221272589 is about 14875.2340821918. The cubic root of 221272589 is about 604.8428332954.

The spelling of 221272589 in words is "two hundred twenty-one million, two hundred seventy-two thousand, five hundred eighty-nine".