2581343945 has 8 divisors (see below), whose sum is σ = 3098324736. Its totient is φ = 2064600496.

The previous prime is 2581343939. The next prime is 2581343953. The reversal of 2581343945 is 5493431852.

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 2581343945 - 2¹⁰ = 2581342921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2581343896 and 2581343905.

It is an unprimeable number.

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, 34457 + ... + 79686.

It is an arithmetic number, because the mean of its divisors is an integer number (387290592).

Almost surely, 2^2581343945 is an apocalyptic number.

It is an amenable number.

2581343945 is a deficient number, since it is larger than the sum of its proper divisors (516980791).

2581343945 is a wasteful number, since it uses less digits than its factorization.

2581343945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118671.

The product of its digits is 518400, while the sum is 44.

The square root of 2581343945 is about 50806.9281200901. The cubic root of 2581343945 is about 1371.7720768256.

The spelling of 2581343945 in words is "two billion, five hundred eighty-one million, three hundred forty-three thousand, nine hundred forty-five".