25044113531 has 4 divisors (see below), whose sum is σ = 25065835512. Its totient is φ = 25022391552.

The previous prime is 25044113473. The next prime is 25044113537. The reversal of 25044113531 is 13531144052.

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 25044113531 - 2¹⁸ = 25043851387 is a prime.

It is a super-2 number, since 2×25044113531² (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 = 25044113494 and 25044113503.

It is not an unprimeable number, because it can be changed into a prime (25044113537) 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, 10859261 + ... + 10861566.

It is an arithmetic number, because the mean of its divisors is an integer number (6266458878).

Almost surely, 2^25044113531 is an apocalyptic number.

25044113531 is a deficient number, since it is larger than the sum of its proper divisors (21721981).

25044113531 is a wasteful number, since it uses less digits than its factorization.

25044113531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21721980.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 25044113531 its reverse (13531144052), we get a palindrome (38575257583).

The spelling of 25044113531 in words is "twenty-five billion, forty-four million, one hundred thirteen thousand, five hundred thirty-one".