25901971 has 2 divisors, whose sum is σ = 25901972. Its totient is φ = 25901970.

The previous prime is 25901963. The next prime is 25901977. The reversal of 25901971 is 17910952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25901971 - 2³ = 25901963 is a prime.

It is not a weakly prime, because it can be changed into another prime (25901977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12950985 + 12950986.

It is an arithmetic number, because the mean of its divisors is an integer number (12950986).

Almost surely, 2^25901971 is an apocalyptic number.

25901971 is a deficient number, since it is larger than the sum of its proper divisors (1).

25901971 is an equidigital number, since it uses as much as digits as its factorization.

25901971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 25901971 is about 5089.3979015204. The cubic root of 25901971 is about 295.8768167430.

The spelling of 25901971 in words is "twenty-five million, nine hundred one thousand, nine hundred seventy-one".