1724253721 has 2 divisors, whose sum is σ = 1724253722. Its totient is φ = 1724253720.

The previous prime is 1724253691. The next prime is 1724253731. The reversal of 1724253721 is 1273524271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1269924496 + 454329225 = 35636^2 + 21315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1724253721 - 2²⁵ = 1690699289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1724253731) 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, 862126860 + 862126861.

It is an arithmetic number, because the mean of its divisors is an integer number (862126861).

Almost surely, 2^1724253721 is an apocalyptic number.

It is an amenable number.

1724253721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1724253721 is an equidigital number, since it uses as much as digits as its factorization.

1724253721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 34.

The square root of 1724253721 is about 41524.1341992822. The cubic root of 1724253721 is about 1199.1321783430.

Adding to 1724253721 its reverse (1273524271), we get a palindrome (2997777992).

The spelling of 1724253721 in words is "one billion, seven hundred twenty-four million, two hundred fifty-three thousand, seven hundred twenty-one".