25906109 has 2 divisors, whose sum is σ = 25906110. Its totient is φ = 25906108.

The previous prime is 25906093. The next prime is 25906121. The reversal of 25906109 is 90160952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24900100 + 1006009 = 4990^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 25906109 - 2⁴ = 25906093 is a prime.

It is a super-2 number, since 2×25906109² = 1342252967039762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25906129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12953054 + 12953055.

It is an arithmetic number, because the mean of its divisors is an integer number (12953055).

Almost surely, 2^25906109 is an apocalyptic number.

It is an amenable number.

25906109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25906109 is an equidigital number, since it uses as much as digits as its factorization.

25906109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 25906109 is about 5089.8044166746. The cubic root of 25906109 is about 295.8925719542.

The spelling of 25906109 in words is "twenty-five million, nine hundred six thousand, one hundred nine".