2561549238 has 64 divisors (see below), whose sum is σ = 5976737280. Its totient is φ = 811651104.

The previous prime is 2561549219. The next prime is 2561549267. The reversal of 2561549238 is 8329451652.

2561549238 is a `hidden beast` number, since 2 + 5 + 615 + 4 + 9 + 23 + 8 = 666.

2561549238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2561549193 and 2561549202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196120 + ... + 208772.

It is an arithmetic number, because the mean of its divisors is an integer number (93386520).

Almost surely, 2^2561549238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2561549238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2988368640).

2561549238 is an abundant number, since it is smaller than the sum of its proper divisors (3415188042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561549238 is a wasteful number, since it uses less digits than its factorization.

2561549238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12850 (or 12844 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 2561549238 is about 50611.7499993826. The cubic root of 2561549238 is about 1368.2566558306.

The spelling of 2561549238 in words is "two billion, five hundred sixty-one million, five hundred forty-nine thousand, two hundred thirty-eight".