25123230531 has 24 divisors (see below), whose sum is σ = 41562892800. Its totient is φ = 14325108336.

The previous prime is 25123230499. The next prime is 25123230617. The reversal of 25123230531 is 13503232152.

It is a happy number.

25123230531 is a `hidden beast` number, since 2 + 5 + 123 + 2 + 3 + 0 + 531 = 666.

It is not a de Polignac number, because 25123230531 - 2⁵ = 25123230499 is a prime.

It is a super-2 number, since 2×25123230531² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25123230495 and 25123230504.

It is not an unprimeable number, because it can be changed into a prime (25123230331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 401481 + ... + 459818.

It is an arithmetic number, because the mean of its divisors is an integer number (1731787200).

Almost surely, 2^25123230531 is an apocalyptic number.

25123230531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25123230531 is a deficient number, since it is larger than the sum of its proper divisors (16439662269).

25123230531 is a wasteful number, since it uses less digits than its factorization.

25123230531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861775 (or 861772 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 25123230531 its reverse (13503232152), we get a palindrome (38626462683).

The spelling of 25123230531 in words is "twenty-five billion, one hundred twenty-three million, two hundred thirty thousand, five hundred thirty-one".