25493861 has 2 divisors, whose sum is σ = 25493862. Its totient is φ = 25493860.

The previous prime is 25493857. The next prime is 25493869. The reversal of 25493861 is 16839452.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21104836 + 4389025 = 4594^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 25493861 - 2² = 25493857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25493869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12746930 + 12746931.

It is an arithmetic number, because the mean of its divisors is an integer number (12746931).

Almost surely, 2^25493861 is an apocalyptic number.

It is an amenable number.

25493861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25493861 is an equidigital number, since it uses as much as digits as its factorization.

25493861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 25493861 is about 5049.1445810157. The cubic root of 25493861 is about 294.3146437835.

The spelling of 25493861 in words is "twenty-five million, four hundred ninety-three thousand, eight hundred sixty-one".