25501571 has 2 divisors, whose sum is σ = 25501572. Its totient is φ = 25501570.

The previous prime is 25501543. The next prime is 25501573. The reversal of 25501571 is 17510552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25501571 - 2⁶ = 25501507 is a prime.

Together with 25501573, it forms a pair of twin primes.

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 25501571.

It is not a weakly prime, because it can be changed into another prime (25501573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12750785 + 12750786.

It is an arithmetic number, because the mean of its divisors is an integer number (12750786).

Almost surely, 2^25501571 is an apocalyptic number.

25501571 is a deficient number, since it is larger than the sum of its proper divisors (1).

25501571 is an equidigital number, since it uses as much as digits as its factorization.

25501571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 25501571 is about 5049.9080189643. The cubic root of 25501571 is about 294.3443102353.

The spelling of 25501571 in words is "twenty-five million, five hundred one thousand, five hundred seventy-one".