25212505 has 8 divisors (see below), whose sum is σ = 30311424. Its totient is φ = 20132400.

The previous prime is 25212493. The next prime is 25212511. The reversal of 25212505 is 50521252.

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

It is not a de Polignac number, because 25212505 - 2²¹ = 23115353 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

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, 1561 + ... + 7270.

It is an arithmetic number, because the mean of its divisors is an integer number (3788928).

Almost surely, 2^25212505 is an apocalyptic number.

It is an amenable number.

25212505 is a deficient number, since it is larger than the sum of its proper divisors (5098919).

25212505 is an equidigital number, since it uses as much as digits as its factorization.

25212505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9407.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 25212505 is about 5021.2055325390. The cubic root of 25212505 is about 293.2279285833.

Adding to 25212505 its reverse (50521252), we get a palindrome (75733757).

The spelling of 25212505 in words is "twenty-five million, two hundred twelve thousand, five hundred five".