25605091 has 2 divisors, whose sum is σ = 25605092. Its totient is φ = 25605090.

The previous prime is 25605089. The next prime is 25605109. The reversal of 25605091 is 19050652.

Together with next prime (25605109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25605091 - 2¹ = 25605089 is a prime.

Together with 25605089, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25605011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802545 + 12802546.

It is an arithmetic number, because the mean of its divisors is an integer number (12802546).

Almost surely, 2^25605091 is an apocalyptic number.

25605091 is a deficient number, since it is larger than the sum of its proper divisors (1).

25605091 is an equidigital number, since it uses as much as digits as its factorization.

25605091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 25605091 is about 5060.1473298709. The cubic root of 25605091 is about 294.7420554758.

The spelling of 25605091 in words is "twenty-five million, six hundred five thousand, ninety-one".