25725531 has 8 divisors (see below), whose sum is σ = 36939280. Its totient is φ = 15831072.

The previous prime is 25725529. The next prime is 25725533. The reversal of 25725531 is 13552752.

It is an interprime number because it is at equal distance from previous prime (25725529) and next prime (25725533).

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

It is not a de Polignac number, because 25725531 - 2¹ = 25725529 is a prime.

It is a super-2 number, since 2×25725531² = 1323605890463922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25725533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329776 + ... + 329853.

It is an arithmetic number, because the mean of its divisors is an integer number (4617410).

Almost surely, 2^25725531 is an apocalyptic number.

25725531 is a deficient number, since it is larger than the sum of its proper divisors (11213749).

25725531 is a wasteful number, since it uses less digits than its factorization.

25725531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659645.

The product of its digits is 10500, while the sum is 30.

The square root of 25725531 is about 5072.0342072979. The cubic root of 25725531 is about 295.2034639652.

The spelling of 25725531 in words is "twenty-five million, seven hundred twenty-five thousand, five hundred thirty-one".