25571729 has 2 divisors, whose sum is σ = 25571730. Its totient is φ = 25571728.

The previous prime is 25571717. The next prime is 25571731. The reversal of 25571729 is 92717552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23261329 + 2310400 = 4823^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 25571729 - 2¹⁶ = 25506193 is a prime.

Together with 25571731, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25571692 and 25571701.

It is not a weakly prime, because it can be changed into another prime (25571759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12785864 + 12785865.

It is an arithmetic number, because the mean of its divisors is an integer number (12785865).

Almost surely, 2^25571729 is an apocalyptic number.

It is an amenable number.

25571729 is a deficient number, since it is larger than the sum of its proper divisors (1).

25571729 is an equidigital number, since it uses as much as digits as its factorization.

25571729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44100, while the sum is 38.

The square root of 25571729 is about 5056.8497110355. The cubic root of 25571729 is about 294.6139890398.

The spelling of 25571729 in words is "twenty-five million, five hundred seventy-one thousand, seven hundred twenty-nine".