25131630 has 16 divisors (see below), whose sum is σ = 60315984. Its totient is φ = 6701760.

The previous prime is 25131629. The next prime is 25131671. The reversal of 25131630 is 3613152.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25131597 and 25131606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418831 + ... + 418890.

It is an arithmetic number, because the mean of its divisors is an integer number (3769749).

Almost surely, 2^25131630 is an apocalyptic number.

25131630 is an abundant number, since it is smaller than the sum of its proper divisors (35184354).

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

25131630 is a wasteful number, since it uses less digits than its factorization.

25131630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837731.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 25131630 is about 5013.1457190072. The cubic root of 25131630 is about 292.9140603800.

Adding to 25131630 its reverse (3613152), we get a palindrome (28744782).

The spelling of 25131630 in words is "twenty-five million, one hundred thirty-one thousand, six hundred thirty".