2561143242 has 64 divisors (see below), whose sum is σ = 6192414720. Its totient is φ = 690332544.

The previous prime is 2561143241. The next prime is 2561143261. The reversal of 2561143242 is 2423411652.

It is not an unprimeable number, because it can be changed into a prime (2561143241) 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 31 ways as a sum of consecutive naturals, for example, 52359 + ... + 88677.

It is an arithmetic number, because the mean of its divisors is an integer number (96756480).

Almost surely, 2^2561143242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2561143242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3096207360).

2561143242 is an abundant number, since it is smaller than the sum of its proper divisors (3631271478).

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

2561143242 is a wasteful number, since it uses less digits than its factorization.

2561143242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36427.

The product of its digits is 11520, while the sum is 30.

The square root of 2561143242 is about 50607.7389536423. The cubic root of 2561143242 is about 1368.1843641523.

Adding to 2561143242 its reverse (2423411652), we get a palindrome (4984554894).

The spelling of 2561143242 in words is "two billion, five hundred sixty-one million, one hundred forty-three thousand, two hundred forty-two".