25180121 has 2 divisors, whose sum is σ = 25180122. Its totient is φ = 25180120.

The previous prime is 25180117. The next prime is 25180159. The reversal of 25180121 is 12108152.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 10465225 = 3836^2 + 3235^2 .

It is a cyclic number.

It is not a de Polignac number, because 25180121 - 2² = 25180117 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25180093 and 25180102.

It is not a weakly prime, because it can be changed into another prime (25180171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12590060 + 12590061.

It is an arithmetic number, because the mean of its divisors is an integer number (12590061).

Almost surely, 2^25180121 is an apocalyptic number.

It is an amenable number.

25180121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25180121 is an equidigital number, since it uses as much as digits as its factorization.

25180121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 25180121 is about 5017.9797727771. The cubic root of 25180121 is about 293.1023300389.

Adding to 25180121 its reverse (12108152), we get a palindrome (37288273).

The spelling of 25180121 in words is "twenty-five million, one hundred eighty thousand, one hundred twenty-one".