25520069 has 4 divisors (see below), whose sum is σ = 25566444. Its totient is φ = 25473696.

The previous prime is 25520063. The next prime is 25520071. The reversal of 25520069 is 96002552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12285025 + 13235044 = 3505^2 + 3638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25520069 is a prime.

It is a super-2 number, since 2×25520069² = 1302547843529522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25520063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22352 + ... + 23465.

It is an arithmetic number, because the mean of its divisors is an integer number (6391611).

Almost surely, 2^25520069 is an apocalyptic number.

It is an amenable number.

25520069 is a deficient number, since it is larger than the sum of its proper divisors (46375).

25520069 is an equidigital number, since it uses as much as digits as its factorization.

25520069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46374.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 25520069 is about 5051.7392054618. The cubic root of 25520069 is about 294.4154622582.

The spelling of 25520069 in words is "twenty-five million, five hundred twenty thousand, sixty-nine".