221598001 has 2 divisors, whose sum is σ = 221598002. Its totient is φ = 221598000.

The previous prime is 221597983. The next prime is 221598059. The reversal of 221598001 is 100895122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193877776 + 27720225 = 13924^2 + 5265^2 .

It is a cyclic number.

It is not a de Polignac number, because 221598001 - 2⁹ = 221597489 is a prime.

It is not a weakly prime, because it can be changed into another prime (221598101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110799000 + 110799001.

It is an arithmetic number, because the mean of its divisors is an integer number (110799001).

Almost surely, 2^221598001 is an apocalyptic number.

It is an amenable number.

221598001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221598001 is an equidigital number, since it uses as much as digits as its factorization.

221598001 is an odious number, because the sum of its binary digits is odd.

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

The square root of 221598001 is about 14886.1681100275. The cubic root of 221598001 is about 605.1391897947.

The spelling of 221598001 in words is "two hundred twenty-one million, five hundred ninety-eight thousand, one".