1728352261 has 2 divisors, whose sum is σ = 1728352262. Its totient is φ = 1728352260.

The previous prime is 1728352259. The next prime is 1728352337. The reversal of 1728352261 is 1622538271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923552100 + 804800161 = 30390^2 + 28369^2 .

It is an emirp because it is prime and its reverse (1622538271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1728352261 - 2¹ = 1728352259 is a prime.

It is a super-3 number, since 3×1728352261³ (a number of 29 digits) contains 333 as substring.

Together with 1728352259, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1728352261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1728352211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864176130 + 864176131.

It is an arithmetic number, because the mean of its divisors is an integer number (864176131).

Almost surely, 2^1728352261 is an apocalyptic number.

It is an amenable number.

1728352261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728352261 is an equidigital number, since it uses as much as digits as its factorization.

1728352261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 1728352261 is about 41573.4562070560. The cubic root of 1728352261 is about 1200.0815363579.

The spelling of 1728352261 in words is "one billion, seven hundred twenty-eight million, three hundred fifty-two thousand, two hundred sixty-one".