25007561 has 4 divisors (see below), whose sum is σ = 26478612. Its totient is φ = 23536512.

The previous prime is 25007551. The next prime is 25007603. The reversal of 25007561 is 16570052.

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 6996025 + 18011536 = 2645^2 + 4244^2 .

It is a cyclic number.

It is not a de Polignac number, because 25007561 - 2²² = 20813257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25007561.

It is not an unprimeable number, because it can be changed into a prime (25007531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 735500 + ... + 735533.

It is an arithmetic number, because the mean of its divisors is an integer number (6619653).

Almost surely, 2^25007561 is an apocalyptic number.

It is an amenable number.

25007561 is a deficient number, since it is larger than the sum of its proper divisors (1471051).

25007561 is a wasteful number, since it uses less digits than its factorization.

25007561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471050.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 25007561 is about 5000.7560428399. The cubic root of 25007561 is about 292.4312488475.

The spelling of 25007561 in words is "twenty-five million, seven thousand, five hundred sixty-one".