2051723605 has 4 divisors (see below), whose sum is σ = 2462068332. Its totient is φ = 1641378880.

The previous prime is 2051723603. The next prime is 2051723617. The reversal of 2051723605 is 5063271502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 892933924 + 1158789681 = 29882^2 + 34041^2 .

It is not a de Polignac number, because 2051723605 - 2¹ = 2051723603 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051723603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205172356 + ... + 205172365.

It is an arithmetic number, because the mean of its divisors is an integer number (615517083).

Almost surely, 2^2051723605 is an apocalyptic number.

It is an amenable number.

2051723605 is a deficient number, since it is larger than the sum of its proper divisors (410344727).

2051723605 is an equidigital number, since it uses as much as digits as its factorization.

2051723605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410344726.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 2051723605 is about 45295.9557245457. The cubic root of 2051723605 is about 1270.6900181113.

The spelling of 2051723605 in words is "two billion, fifty-one million, seven hundred twenty-three thousand, six hundred five".