25000691 has 2 divisors, whose sum is σ = 25000692. Its totient is φ = 25000690.

The previous prime is 25000681. The next prime is 25000709. The reversal of 25000691 is 19600052.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25000691 - 2⁶ = 25000627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (25000621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12500345 + 12500346.

It is an arithmetic number, because the mean of its divisors is an integer number (12500346).

Almost surely, 2^25000691 is an apocalyptic number.

25000691 is a deficient number, since it is larger than the sum of its proper divisors (1).

25000691 is an equidigital number, since it uses as much as digits as its factorization.

25000691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 25000691 is about 5000.0690995225. The cubic root of 25000691 is about 292.4044677915.

The spelling of 25000691 in words is "twenty-five million, six hundred ninety-one", and thus it is an aban number.