25131015 has 144 divisors (see below), whose sum is σ = 59911488. Its totient is φ = 9455616.

The previous prime is 25131011. The next prime is 25131017. The reversal of 25131015 is 51013152.

It is not a de Polignac number, because 25131015 - 2² = 25131011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25131011) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1322676 + ... + 1322694.

It is an arithmetic number, because the mean of its divisors is an integer number (416052).

Almost surely, 2^25131015 is an apocalyptic number.

25131015 is an abundant number, since it is smaller than the sum of its proper divisors (34780473).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25131015 is a wasteful number, since it uses less digits than its factorization.

25131015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 25131015 is about 5013.0843799003. The cubic root of 25131015 is about 292.9116710454.

Adding to 25131015 its reverse (51013152), we get a palindrome (76144167).

The spelling of 25131015 in words is "twenty-five million, one hundred thirty-one thousand, fifteen".