25707691 has 2 divisors, whose sum is σ = 25707692. Its totient is φ = 25707690.

The previous prime is 25707653. The next prime is 25707701. The reversal of 25707691 is 19670752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25707691 - 2¹¹ = 25705643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25707691.

It is not a weakly prime, because it can be changed into another prime (25707641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12853845 + 12853846.

It is an arithmetic number, because the mean of its divisors is an integer number (12853846).

Almost surely, 2^25707691 is an apocalyptic number.

25707691 is a deficient number, since it is larger than the sum of its proper divisors (1).

25707691 is an equidigital number, since it uses as much as digits as its factorization.

25707691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 25707691 is about 5070.2752390773. The cubic root of 25707691 is about 295.1352094927.

The spelling of 25707691 in words is "twenty-five million, seven hundred seven thousand, six hundred ninety-one".