25135323231 has 16 divisors (see below), whose sum is σ = 35494087040. Its totient is φ = 15777542880.

The previous prime is 25135323167. The next prime is 25135323233. The reversal of 25135323231 is 13232353152.

It is a happy number.

It is not a de Polignac number, because 25135323231 - 2⁶ = 25135323167 is a prime.

It is a super-2 number, since 2×25135323231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25135323233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1343380 + ... + 1361961.

It is an arithmetic number, because the mean of its divisors is an integer number (2218380440).

Almost surely, 2^25135323231 is an apocalyptic number.

25135323231 is a deficient number, since it is larger than the sum of its proper divisors (10358763809).

25135323231 is a wasteful number, since it uses less digits than its factorization.

25135323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705526.

The product of its digits is 16200, while the sum is 30.

Adding to 25135323231 its reverse (13232353152), we get a palindrome (38367676383).

The spelling of 25135323231 in words is "twenty-five billion, one hundred thirty-five million, three hundred twenty-three thousand, two hundred thirty-one".