2581600405 has 4 divisors (see below), whose sum is σ = 3097920492. Its totient is φ = 2065280320.

The previous prime is 2581600369. The next prime is 2581600409. The reversal of 2581600405 is 5040061852.

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 1409702116 + 1171898289 = 37546^2 + 34233^2 .

It is not a de Polignac number, because 2581600405 - 2⁹ = 2581599893 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 (2581600409) 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 3 ways as a sum of consecutive naturals, for example, 258160036 + ... + 258160045.

It is an arithmetic number, because the mean of its divisors is an integer number (774480123).

Almost surely, 2^2581600405 is an apocalyptic number.

It is an amenable number.

2581600405 is a deficient number, since it is larger than the sum of its proper divisors (516320087).

2581600405 is an equidigital number, since it uses as much as digits as its factorization.

2581600405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516320086.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 2581600405 is about 50809.4519257982. The cubic root of 2581600405 is about 1371.8175044561.

The spelling of 2581600405 in words is "two billion, five hundred eighty-one million, six hundred thousand, four hundred five".