25918961 has 8 divisors (see below), whose sum is σ = 26844264. Its totient is φ = 25009920.

The previous prime is 25918943. The next prime is 25918987. The reversal of 25918961 is 16981952.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1515361 + 24403600 = 1231^2 + 4940^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25918961 - 2¹⁰ = 25917937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25918561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 776 + ... + 7241.

It is an arithmetic number, because the mean of its divisors is an integer number (3355533).

Almost surely, 2^25918961 is an apocalyptic number.

It is an amenable number.

25918961 is a deficient number, since it is larger than the sum of its proper divisors (925303).

25918961 is an equidigital number, since it uses as much as digits as its factorization.

25918961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8131.

The product of its digits is 38880, while the sum is 41.

The square root of 25918961 is about 5091.0667840837. The cubic root of 25918961 is about 295.9414945546.

The spelling of 25918961 in words is "twenty-five million, nine hundred eighteen thousand, nine hundred sixty-one".