25721071 has 2 divisors, whose sum is σ = 25721072. Its totient is φ = 25721070.

The previous prime is 25721027. The next prime is 25721147. The reversal of 25721071 is 17012752.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25721071 - 2⁷ = 25720943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25721011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12860535 + 12860536.

It is an arithmetic number, because the mean of its divisors is an integer number (12860536).

Almost surely, 2^25721071 is an apocalyptic number.

25721071 is a deficient number, since it is larger than the sum of its proper divisors (1).

25721071 is an equidigital number, since it uses as much as digits as its factorization.

25721071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 25721071 is about 5071.5945224357. The cubic root of 25721071 is about 295.1864033061.

The spelling of 25721071 in words is "twenty-five million, seven hundred twenty-one thousand, seventy-one".