25336561 has 4 divisors (see below), whose sum is σ = 25476724. Its totient is φ = 25196400.

The previous prime is 25336559. The next prime is 25336567. The reversal of 25336561 is 16563352.

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 136161 + 25200400 = 369^2 + 5020^2 .

It is a cyclic number.

It is not a de Polignac number, because 25336561 - 2¹ = 25336559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25336567) 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, 69810 + ... + 70171.

It is an arithmetic number, because the mean of its divisors is an integer number (6369181).

Almost surely, 2^25336561 is an apocalyptic number.

It is an amenable number.

25336561 is a deficient number, since it is larger than the sum of its proper divisors (140163).

25336561 is a wasteful number, since it uses less digits than its factorization.

25336561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140162.

The product of its digits is 16200, while the sum is 31.

The square root of 25336561 is about 5033.5435828053. The cubic root of 25336561 is about 293.7080763469.

The spelling of 25336561 in words is "twenty-five million, three hundred thirty-six thousand, five hundred sixty-one".