25417813 has 2 divisors, whose sum is σ = 25417814. Its totient is φ = 25417812.

The previous prime is 25417807. The next prime is 25417817. The reversal of 25417813 is 31871452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15539364 + 9878449 = 3942^2 + 3143^2 .

It is a cyclic number.

It is not a de Polignac number, because 25417813 - 2⁵ = 25417781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25417817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12708906 + 12708907.

It is an arithmetic number, because the mean of its divisors is an integer number (12708907).

Almost surely, 2^25417813 is an apocalyptic number.

It is an amenable number.

25417813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25417813 is an equidigital number, since it uses as much as digits as its factorization.

25417813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 25417813 is about 5041.6081759693. The cubic root of 25417813 is about 294.0217061735.

The spelling of 25417813 in words is "twenty-five million, four hundred seventeen thousand, eight hundred thirteen".