1726641641 has 4 divisors (see below), whose sum is σ = 1742482500. Its totient is φ = 1710800784.

The previous prime is 1726641619. The next prime is 1726641647. The reversal of 1726641641 is 1461466271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1461466271 = 26113 ⋅55967.

It can be written as a sum of positive squares in 2 ways, for example, as 521163241 + 1205478400 = 22829^2 + 34720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1726641641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1726641595 and 1726641604.

It is not an unprimeable number, because it can be changed into a prime (1726641647) 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 3 ways as a sum of consecutive naturals, for example, 7920266 + ... + 7920483.

It is an arithmetic number, because the mean of its divisors is an integer number (435620625).

Almost surely, 2^1726641641 is an apocalyptic number.

It is an amenable number.

1726641641 is a deficient number, since it is larger than the sum of its proper divisors (15840859).

1726641641 is a wasteful number, since it uses less digits than its factorization.

1726641641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15840858.

The product of its digits is 48384, while the sum is 38.

The square root of 1726641641 is about 41552.8776500497. The cubic root of 1726641641 is about 1199.6854826192.

The spelling of 1726641641 in words is "one billion, seven hundred twenty-six million, six hundred forty-one thousand, six hundred forty-one".