2651381805 has 32 divisors (see below), whose sum is σ = 4338639360. Its totient is φ = 1382284800.

The previous prime is 2651381767. The next prime is 2651381807. The reversal of 2651381805 is 5081831562.

It is not a de Polignac number, because 2651381805 - 2¹⁵ = 2651349037 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651381807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108609 + ... + 130761.

It is an arithmetic number, because the mean of its divisors is an integer number (135582480).

Almost surely, 2^2651381805 is an apocalyptic number.

It is an amenable number.

2651381805 is a deficient number, since it is larger than the sum of its proper divisors (1687257555).

2651381805 is a wasteful number, since it uses less digits than its factorization.

2651381805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22341.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 2651381805 is about 51491.5702324177. The cubic root of 2651381805 is about 1384.0679876068.

The spelling of 2651381805 in words is "two billion, six hundred fifty-one million, three hundred eighty-one thousand, eight hundred five".