25443961 has 4 divisors (see below), whose sum is σ = 25555300. Its totient is φ = 25332624.

The previous prime is 25443959. The next prime is 25443989. The reversal of 25443961 is 16934452.

It is a happy number.

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 23580736 + 1863225 = 4856^2 + 1365^2 .

It is a cyclic number.

It is not a de Polignac number, because 25443961 - 2¹ = 25443959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25443361) 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, 55326 + ... + 55783.

It is an arithmetic number, because the mean of its divisors is an integer number (6388825).

Almost surely, 2^25443961 is an apocalyptic number.

It is an amenable number.

25443961 is a deficient number, since it is larger than the sum of its proper divisors (111339).

25443961 is a wasteful number, since it uses less digits than its factorization.

25443961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111338.

The product of its digits is 25920, while the sum is 34.

The square root of 25443961 is about 5044.2007295507. The cubic root of 25443961 is about 294.1224943460.

The spelling of 25443961 in words is "twenty-five million, four hundred forty-three thousand, nine hundred sixty-one".