2051723671 has 4 divisors (see below), whose sum is σ = 2140929072. Its totient is φ = 1962518272.

The previous prime is 2051723669. The next prime is 2051723731. The reversal of 2051723671 is 1763271502.

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

It is a cyclic number.

It is not a de Polignac number, because 2051723671 - 2¹ = 2051723669 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 (2051723621) 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, 44602666 + ... + 44602711.

It is an arithmetic number, because the mean of its divisors is an integer number (535232268).

Almost surely, 2^2051723671 is an apocalyptic number.

2051723671 is a deficient number, since it is larger than the sum of its proper divisors (89205401).

2051723671 is an equidigital number, since it uses as much as digits as its factorization.

2051723671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89205400.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 2051723671 is about 45295.9564530875. The cubic root of 2051723671 is about 1270.6900317365.

The spelling of 2051723671 in words is "two billion, fifty-one million, seven hundred twenty-three thousand, six hundred seventy-one".