2561423136 has 48 divisors (see below), whose sum is σ = 7077621600. Its totient is φ = 808869888.

The previous prime is 2561423131. The next prime is 2561423149. The reversal of 2561423136 is 6313241652.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 2561423097 and 2561423106.

It is not an unprimeable number, because it can be changed into a prime (2561423131) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 700321 + ... + 703968.

It is an arithmetic number, because the mean of its divisors is an integer number (147450450).

Almost surely, 2^2561423136 is an apocalyptic number.

It is an amenable number.

2561423136 is an abundant number, since it is smaller than the sum of its proper divisors (4516198464).

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

2561423136 is a wasteful number, since it uses less digits than its factorization.

2561423136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404321 (or 1404313 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 2561423136 is about 50610.5042061428. The cubic root of 2561423136 is about 1368.2342029169.

Adding to 2561423136 its reverse (6313241652), we get a palindrome (8874664788).

The spelling of 2561423136 in words is "two billion, five hundred sixty-one million, four hundred twenty-three thousand, one hundred thirty-six".