25740691 has 2 divisors, whose sum is σ = 25740692. Its totient is φ = 25740690.

The previous prime is 25740653. The next prime is 25740713. The reversal of 25740691 is 19604752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25740691 - 2¹⁹ = 25216403 is a prime.

It is not a weakly prime, because it can be changed into another prime (25740391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12870345 + 12870346.

It is an arithmetic number, because the mean of its divisors is an integer number (12870346).

Almost surely, 2^25740691 is an apocalyptic number.

25740691 is a deficient number, since it is larger than the sum of its proper divisors (1).

25740691 is an equidigital number, since it uses as much as digits as its factorization.

25740691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 25740691 is about 5073.5284566069. The cubic root of 25740691 is about 295.2614401667.

The spelling of 25740691 in words is "twenty-five million, seven hundred forty thousand, six hundred ninety-one".