25445641 has 4 divisors (see below), whose sum is σ = 27403012. Its totient is φ = 23488272.

The previous prime is 25445633. The next prime is 25445647. The reversal of 25445641 is 14654452.

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 6610041 + 18835600 = 2571^2 + 4340^2 .

It is a cyclic number.

It is not a de Polignac number, because 25445641 - 2³ = 25445633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25445647) 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, 978666 + ... + 978691.

It is an arithmetic number, because the mean of its divisors is an integer number (6850753).

Almost surely, 2^25445641 is an apocalyptic number.

It is an amenable number.

25445641 is a deficient number, since it is larger than the sum of its proper divisors (1957371).

25445641 is a wasteful number, since it uses less digits than its factorization.

25445641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957370.

The product of its digits is 19200, while the sum is 31.

The square root of 25445641 is about 5044.3672546713. The cubic root of 25445641 is about 294.1289675902.

The spelling of 25445641 in words is "twenty-five million, four hundred forty-five thousand, six hundred forty-one".