25231505 has 8 divisors (see below), whose sum is σ = 32606952. Its totient is φ = 18632448.

The previous prime is 25231499. The next prime is 25231513. The reversal of 25231505 is 50513252.

It can be written as a sum of positive squares in 4 ways, for example, as 719104 + 24512401 = 848^2 + 4951^2 .

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 25231505 - 2⁸ = 25231249 is a prime.

It is a super-3 number, since 3×25231505³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon 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, 194024 + ... + 194153.

It is an arithmetic number, because the mean of its divisors is an integer number (4075869).

Almost surely, 2^25231505 is an apocalyptic number.

It is an amenable number.

25231505 is a deficient number, since it is larger than the sum of its proper divisors (7375447).

25231505 is a wasteful number, since it uses less digits than its factorization.

25231505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388195.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 25231505 is about 5023.0971521562. The cubic root of 25231505 is about 293.3015683865.

Adding to 25231505 its reverse (50513252), we get a palindrome (75744757).

The spelling of 25231505 in words is "twenty-five million, two hundred thirty-one thousand, five hundred five".