2581073409 has 16 divisors (see below), whose sum is σ = 3674575872. Its totient is φ = 1607623248.

The previous prime is 2581073389. The next prime is 2581073431. The reversal of 2581073409 is 9043701852.

It is not a de Polignac number, because 2581073409 - 2⁵ = 2581073377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2581072409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431997 + ... + 437930.

It is an arithmetic number, because the mean of its divisors is an integer number (229660992).

Almost surely, 2^2581073409 is an apocalyptic number.

It is an amenable number.

2581073409 is a deficient number, since it is larger than the sum of its proper divisors (1093502463).

2581073409 is a wasteful number, since it uses less digits than its factorization.

2581073409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869996.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 2581073409 is about 50804.2656575213. The cubic root of 2581073409 is about 1371.7241526042.

The spelling of 2581073409 in words is "two billion, five hundred eighty-one million, seventy-three thousand, four hundred nine".