221591063 has 2 divisors, whose sum is σ = 221591064. Its totient is φ = 221591062.

The previous prime is 221591057. The next prime is 221591087. The reversal of 221591063 is 360195122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221591063 - 2¹⁴ = 221574679 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221591023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110795531 + 110795532.

It is an arithmetic number, because the mean of its divisors is an integer number (110795532).

Almost surely, 2^221591063 is an apocalyptic number.

221591063 is a deficient number, since it is larger than the sum of its proper divisors (1).

221591063 is an equidigital number, since it uses as much as digits as its factorization.

221591063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 221591063 is about 14885.9350730816. The cubic root of 221591063 is about 605.1328743053.

The spelling of 221591063 in words is "two hundred twenty-one million, five hundred ninety-one thousand, sixty-three".