25319971 has 2 divisors, whose sum is σ = 25319972. Its totient is φ = 25319970.

The previous prime is 25319969. The next prime is 25320011. The reversal of 25319971 is 17991352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25319971 - 2¹ = 25319969 is a prime.

It is a super-2 number, since 2×25319971² = 1282201862881682, which contains 22 as substring.

Together with 25319969, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25319971.

It is not a weakly prime, because it can be changed into another prime (25329971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12659985 + 12659986.

It is an arithmetic number, because the mean of its divisors is an integer number (12659986).

Almost surely, 2^25319971 is an apocalyptic number.

25319971 is a deficient number, since it is larger than the sum of its proper divisors (1).

25319971 is an equidigital number, since it uses as much as digits as its factorization.

25319971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010, while the sum is 37.

The square root of 25319971 is about 5031.8953685465. The cubic root of 25319971 is about 293.6439571362.

The spelling of 25319971 in words is "twenty-five million, three hundred nineteen thousand, nine hundred seventy-one".