25621109 has 2 divisors, whose sum is σ = 25621110. Its totient is φ = 25621108.

The previous prime is 25621087. The next prime is 25621117. The reversal of 25621109 is 90112652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24850225 + 770884 = 4985^2 + 878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25621109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25621129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12810554 + 12810555.

It is an arithmetic number, because the mean of its divisors is an integer number (12810555).

Almost surely, 2^25621109 is an apocalyptic number.

It is an amenable number.

25621109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621109 is an equidigital number, since it uses as much as digits as its factorization.

25621109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 25621109 is about 5061.7298426526. The cubic root of 25621109 is about 294.8035041164.

The spelling of 25621109 in words is "twenty-five million, six hundred twenty-one thousand, one hundred nine".