2561231142 has 48 divisors (see below), whose sum is σ = 5621166720. Its totient is φ = 842726016.

The previous prime is 2561231119. The next prime is 2561231243. The reversal of 2561231142 is 2411321652.

2561231142 is a `hidden beast` number, since 2 + 5 + 612 + 3 + 1 + 1 + 42 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1404043 + ... + 1405865.

It is an arithmetic number, because the mean of its divisors is an integer number (117107640).

Almost surely, 2^2561231142 is an apocalyptic number.

2561231142 is an abundant number, since it is smaller than the sum of its proper divisors (3059935578).

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

2561231142 is a wasteful number, since it uses less digits than its factorization.

2561231142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797 (or 2794 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2561231142 is about 50608.6073904430. The cubic root of 2561231142 is about 1368.2000162809.

Adding to 2561231142 its reverse (2411321652), we get a palindrome (4972552794).

The spelling of 2561231142 in words is "two billion, five hundred sixty-one million, two hundred thirty-one thousand, one hundred forty-two".