25020001 has 2 divisors, whose sum is σ = 25020002. Its totient is φ = 25020000.

The previous prime is 25019999. The next prime is 25020019. The reversal of 25020001 is 10002052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25010001 + 10000 = 5001^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 25020001 - 2¹ = 25019999 is a prime.

Together with 25019999, 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 25020001.

It is not a weakly prime, because it can be changed into another prime (25020031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12510000 + 12510001.

It is an arithmetic number, because the mean of its divisors is an integer number (12510001).

Almost surely, 2^25020001 is an apocalyptic number.

It is an amenable number.

25020001 is a deficient number, since it is larger than the sum of its proper divisors (1).

25020001 is an equidigital number, since it uses as much as digits as its factorization.

25020001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 25020001 is about 5001.9997001199. Note that the first 3 decimals coincide. The cubic root of 25020001 is about 292.4797307405.

Adding to 25020001 its reverse (10002052), we get a palindrome (35022053).

The spelling of 25020001 in words is "twenty-five million, twenty thousand, one".