25445501 has 2 divisors, whose sum is σ = 25445502. Its totient is φ = 25445500.

The previous prime is 25445491. The next prime is 25445527. The reversal of 25445501 is 10554452.

It is an a-pointer prime, because the next prime (25445527) can be obtained adding 25445501 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 5285401 = 4490^2 + 2299^2 .

It is a cyclic number.

It is not a de Polignac number, because 25445501 - 2⁶ = 25445437 is a prime.

It is a super-2 number, since 2×25445501² = 1294947042282002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25445531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12722750 + 12722751.

It is an arithmetic number, because the mean of its divisors is an integer number (12722751).

Almost surely, 2^25445501 is an apocalyptic number.

It is an amenable number.

25445501 is a deficient number, since it is larger than the sum of its proper divisors (1).

25445501 is an equidigital number, since it uses as much as digits as its factorization.

25445501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 25445501 is about 5044.3533777879. The cubic root of 25445501 is about 294.1284281640.

Adding to 25445501 its reverse (10554452), we get a palindrome (35999953).

The spelling of 25445501 in words is "twenty-five million, four hundred forty-five thousand, five hundred one".