25122313531 has 32 divisors (see below), whose sum is σ = 29271166848. Its totient is φ = 21118648320.

The previous prime is 25122313529. The next prime is 25122313543. The reversal of 25122313531 is 13531322152.

It is not a de Polignac number, because 25122313531 - 2¹ = 25122313529 is a prime.

It is a super-2 number, since 2×25122313531² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25122313531.

It is not an unprimeable number, because it can be changed into a prime (25122313031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67351861 + ... + 67352233.

It is an arithmetic number, because the mean of its divisors is an integer number (914723964).

Almost surely, 2^25122313531 is an apocalyptic number.

25122313531 is a deficient number, since it is larger than the sum of its proper divisors (4148853317).

25122313531 is a wasteful number, since it uses less digits than its factorization.

25122313531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111.

The product of its digits is 5400, while the sum is 28.

Adding to 25122313531 its reverse (13531322152), we get a palindrome (38653635683).

The spelling of 25122313531 in words is "twenty-five billion, one hundred twenty-two million, three hundred thirteen thousand, five hundred thirty-one".