25122215 has 8 divisors (see below), whose sum is σ = 30439968. Its totient is φ = 19902240.

The previous prime is 25122197. The next prime is 25122221. The reversal of 25122215 is 51222152.

It is a happy number.

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

It is not a de Polignac number, because 25122215 - 2⁶ = 25122151 is a prime.

It is a super-2 number, since 2×25122215² = 1262251373012450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23876 + ... + 24905.

It is an arithmetic number, because the mean of its divisors is an integer number (3804996).

Almost surely, 2^25122215 is an apocalyptic number.

25122215 is a deficient number, since it is larger than the sum of its proper divisors (5317753).

25122215 is a wasteful number, since it uses less digits than its factorization.

25122215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48889.

The product of its digits is 400, while the sum is 20.

The square root of 25122215 is about 5012.2065998919. The cubic root of 25122215 is about 292.8774779228.

Adding to 25122215 its reverse (51222152), we get a palindrome (76344367).

The spelling of 25122215 in words is "twenty-five million, one hundred twenty-two thousand, two hundred fifteen".