1721725219 has 2 divisors, whose sum is σ = 1721725220. Its totient is φ = 1721725218.

The previous prime is 1721725217. The next prime is 1721725231. The reversal of 1721725219 is 9125271271.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721725219 - 2¹ = 1721725217 is a prime.

It is a super-2 number, since 2×1721725219² = 5928675459481195922, which contains 22 as substring.

Together with 1721725217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1721725217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860862609 + 860862610.

It is an arithmetic number, because the mean of its divisors is an integer number (860862610).

Almost surely, 2^1721725219 is an apocalyptic number.

1721725219 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721725219 is an equidigital number, since it uses as much as digits as its factorization.

1721725219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 37.

The square root of 1721725219 is about 41493.6768556367. The cubic root of 1721725219 is about 1198.5457427232.

It can be divided in two parts, 17217 and 25219, that added together give a square (42436 = 206²).

The spelling of 1721725219 in words is "one billion, seven hundred twenty-one million, seven hundred twenty-five thousand, two hundred nineteen".