2581279247 has 8 divisors (see below), whose sum is σ = 2599350144. Its totient is φ = 2563235928.

The previous prime is 2581279243. The next prime is 2581279279. The reversal of 2581279247 is 7429721852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2581279247 - 2² = 2581279243 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 (2581279243) 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 7 ways as a sum of consecutive naturals, for example, 202958 + ... + 215300.

It is an arithmetic number, because the mean of its divisors is an integer number (324918768).

Almost surely, 2^2581279247 is an apocalyptic number.

2581279247 is a deficient number, since it is larger than the sum of its proper divisors (18070897).

2581279247 is a wasteful number, since it uses less digits than its factorization.

2581279247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13789.

The product of its digits is 564480, while the sum is 47.

The square root of 2581279247 is about 50806.2914115959. The cubic root of 2581279247 is about 1371.7606161739.

The spelling of 2581279247 in words is "two billion, five hundred eighty-one million, two hundred seventy-nine thousand, two hundred forty-seven".