25129129 has 2 divisors, whose sum is σ = 25129130. Its totient is φ = 25129128.

The previous prime is 25129121. The next prime is 25129151. The reversal of 25129129 is 92192152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22306729 + 2822400 = 4723^2 + 1680^2 .

It is a cyclic number.

It is not a de Polignac number, because 25129129 - 2³ = 25129121 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25129129.

It is not a weakly prime, because it can be changed into another prime (25129121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12564564 + 12564565.

It is an arithmetic number, because the mean of its divisors is an integer number (12564565).

Almost surely, 2^25129129 is an apocalyptic number.

It is an amenable number.

25129129 is a deficient number, since it is larger than the sum of its proper divisors (1).

25129129 is an equidigital number, since it uses as much as digits as its factorization.

25129129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 31.

The square root of 25129129 is about 5012.8962686256. The cubic root of 25129129 is about 292.9043435097.

The spelling of 25129129 in words is "twenty-five million, one hundred twenty-nine thousand, one hundred twenty-nine".