25705231 has 8 divisors (see below), whose sum is σ = 26611200. Its totient is φ = 24804120.

The previous prime is 25705219. The next prime is 25705249. The reversal of 25705231 is 13250752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25705231 - 2⁷ = 25705103 is a prime.

It is a super-2 number, since 2×25705231² = 1321517801526722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25705196 and 25705205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25705261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12000 + ... + 13978.

It is an arithmetic number, because the mean of its divisors is an integer number (3326400).

Almost surely, 2^25705231 is an apocalyptic number.

25705231 is a deficient number, since it is larger than the sum of its proper divisors (905969).

25705231 is a wasteful number, since it uses less digits than its factorization.

25705231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 25705231 is about 5070.0326428929. The cubic root of 25705231 is about 295.1257952442.

Adding to 25705231 its reverse (13250752), we get a palindrome (38955983).

The spelling of 25705231 in words is "twenty-five million, seven hundred five thousand, two hundred thirty-one".