1728723133 has 2 divisors, whose sum is σ = 1728723134. Its totient is φ = 1728723132.

The previous prime is 1728723131. The next prime is 1728723169. The reversal of 1728723133 is 3313278271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1016206884 + 712516249 = 31878^2 + 26693^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728723133 - 2¹ = 1728723131 is a prime.

Together with 1728723131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1728723092 and 1728723101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1728723131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864361566 + 864361567.

It is an arithmetic number, because the mean of its divisors is an integer number (864361567).

Almost surely, 2^1728723133 is an apocalyptic number.

It is an amenable number.

1728723133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728723133 is an equidigital number, since it uses as much as digits as its factorization.

1728723133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 1728723133 is about 41577.9164100367. The cubic root of 1728723133 is about 1200.1673685535.

The spelling of 1728723133 in words is "one billion, seven hundred twenty-eight million, seven hundred twenty-three thousand, one hundred thirty-three".