25507813 has 2 divisors, whose sum is σ = 25507814. Its totient is φ = 25507812.

The previous prime is 25507789. The next prime is 25507817. The reversal of 25507813 is 31870552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23203489 + 2304324 = 4817^2 + 1518^2 .

It is a cyclic number.

It is not a de Polignac number, because 25507813 - 2⁹ = 25507301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25507817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12753906 + 12753907.

It is an arithmetic number, because the mean of its divisors is an integer number (12753907).

Almost surely, 2^25507813 is an apocalyptic number.

It is an amenable number.

25507813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25507813 is an equidigital number, since it uses as much as digits as its factorization.

25507813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 25507813 is about 5050.5260122090. The cubic root of 25507813 is about 294.3683237532.

The spelling of 25507813 in words is "twenty-five million, five hundred seven thousand, eight hundred thirteen".