25520515 has 8 divisors (see below), whose sum is σ = 32236560. Its totient is φ = 19341792.

The previous prime is 25520489. The next prime is 25520527. The reversal of 25520515 is 51502552.

It is a happy number.

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 25520515 - 2⁹ = 25520003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25520515.

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, 134224 + ... + 134413.

It is an arithmetic number, because the mean of its divisors is an integer number (4029570).

Almost surely, 2^25520515 is an apocalyptic number.

25520515 is a deficient number, since it is larger than the sum of its proper divisors (6716045).

25520515 is a wasteful number, since it uses less digits than its factorization.

25520515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268661.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 25520515 is about 5051.7833484820. The cubic root of 25520515 is about 294.4171773598.

It can be divided in two parts, 255 and 20515, that multiplied together give a palindrome (5231325).

The spelling of 25520515 in words is "twenty-five million, five hundred twenty thousand, five hundred fifteen".