1729820061 has 12 divisors (see below), whose sum is σ = 2501089500. Its totient is φ = 1152077760.

The previous prime is 1729820033. The next prime is 1729820063. The reversal of 1729820061 is 1600289271.

It can be written as a sum of positive squares in 2 ways, for example, as 365995161 + 1363824900 = 19131^2 + 36930^2 .

It is not a de Polignac number, because 1729820061 - 2⁹ = 1729819549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1729819998 and 1729820025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1729820063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84936 + ... + 103313.

It is an arithmetic number, because the mean of its divisors is an integer number (208424125).

Almost surely, 2^1729820061 is an apocalyptic number.

It is an amenable number.

1729820061 is a deficient number, since it is larger than the sum of its proper divisors (771269439).

1729820061 is a wasteful number, since it uses less digits than its factorization.

1729820061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189276 (or 189273 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1729820061 is about 41591.1055515479. The cubic root of 1729820061 is about 1200.4211625844.

The spelling of 1729820061 in words is "one billion, seven hundred twenty-nine million, eight hundred twenty thousand, sixty-one".