25544240131 has 4 divisors (see below), whose sum is σ = 25646010264. Its totient is φ = 25442470000.

The previous prime is 25544240119. The next prime is 25544240173. The reversal of 25544240131 is 13104244552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25544240131 - 2⁷ = 25544240003 is a prime.

It is a super-2 number, since 2×25544240131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25544240093 and 25544240102.

It is not an unprimeable number, because it can be changed into a prime (25544240191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50884690 + ... + 50885191.

It is an arithmetic number, because the mean of its divisors is an integer number (6411502566).

Almost surely, 2^25544240131 is an apocalyptic number.

25544240131 is a deficient number, since it is larger than the sum of its proper divisors (101770133).

25544240131 is a wasteful number, since it uses less digits than its factorization.

25544240131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101770132.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 25544240131 its reverse (13104244552), we get a palindrome (38648484683).

The spelling of 25544240131 in words is "twenty-five billion, five hundred forty-four million, two hundred forty thousand, one hundred thirty-one".