25561834 has 4 divisors (see below), whose sum is σ = 38342754. Its totient is φ = 12780916.

The previous prime is 25561831. The next prime is 25561841. The reversal of 25561834 is 43816552.

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

It can be written as a sum of positive squares in only one way, i.e., 24453025 + 1108809 = 4945^2 + 1053^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25561834.

It is not an unprimeable number, because it can be changed into a prime (25561831) by changing a digit.

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 as a sum of consecutive naturals, namely, 6390457 + ... + 6390460.

Almost surely, 2^25561834 is an apocalyptic number.

25561834 is a deficient number, since it is larger than the sum of its proper divisors (12780920).

25561834 is a wasteful number, since it uses less digits than its factorization.

25561834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12780919.

The product of its digits is 28800, while the sum is 34.

The square root of 25561834 is about 5055.8712404491. The cubic root of 25561834 is about 294.5759837682.

The spelling of 25561834 in words is "twenty-five million, five hundred sixty-one thousand, eight hundred thirty-four".