1731728861 has 4 divisors (see below), whose sum is σ = 1731976224. Its totient is φ = 1731481500.

The previous prime is 1731728827. The next prime is 1731728879. The reversal of 1731728861 is 1688271371.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1731728861 - 2²⁶ = 1664619997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1731728821) 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 in 3 ways as a sum of consecutive naturals, for example, 112865 + ... + 127286.

It is an arithmetic number, because the mean of its divisors is an integer number (432994056).

Almost surely, 2^1731728861 is an apocalyptic number.

It is an amenable number.

1731728861 is a deficient number, since it is larger than the sum of its proper divisors (247363).

1731728861 is an equidigital number, since it uses as much as digits as its factorization.

1731728861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247362.

The product of its digits is 112896, while the sum is 44.

The square root of 1731728861 is about 41614.0464386726. The cubic root of 1731728861 is about 1200.8625421375.

The spelling of 1731728861 in words is "one billion, seven hundred thirty-one million, seven hundred twenty-eight thousand, eight hundred sixty-one".