25115105531 has 4 divisors (see below), whose sum is σ = 25137470952. Its totient is φ = 25092740112.

The previous prime is 25115105513. The next prime is 25115105593. The reversal of 25115105531 is 13550151152.

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 25115105531 - 2⁶ = 25115105467 is a prime.

It is a super-2 number, since 2×25115105531² (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 = 25115105494 and 25115105503.

It is not an unprimeable number, because it can be changed into a prime (25115155531) 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, 11181026 + ... + 11183271.

It is an arithmetic number, because the mean of its divisors is an integer number (6284367738).

Almost surely, 2^25115105531 is an apocalyptic number.

25115105531 is a deficient number, since it is larger than the sum of its proper divisors (22365421).

25115105531 is a wasteful number, since it uses less digits than its factorization.

25115105531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22365420.

The product of its (nonzero) digits is 3750, while the sum is 29.

Adding to 25115105531 its reverse (13550151152), we get a palindrome (38665256683).

The spelling of 25115105531 in words is "twenty-five billion, one hundred fifteen million, one hundred five thousand, five hundred thirty-one".