1721281559 has 2 divisors, whose sum is σ = 1721281560. Its totient is φ = 1721281558.

The previous prime is 1721281547. The next prime is 1721281577. The reversal of 1721281559 is 9551821271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721281559 - 2¹² = 1721277463 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 (1721281519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860640779 + 860640780.

It is an arithmetic number, because the mean of its divisors is an integer number (860640780).

Almost surely, 2^1721281559 is an apocalyptic number.

1721281559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721281559 is an equidigital number, since it uses as much as digits as its factorization.

1721281559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 41.

The square root of 1721281559 is about 41488.3303954257. The cubic root of 1721281559 is about 1198.4427854338.

The spelling of 1721281559 in words is "one billion, seven hundred twenty-one million, two hundred eighty-one thousand, five hundred fifty-nine".