25218029 has 2 divisors, whose sum is σ = 25218030. Its totient is φ = 25218028.

The previous prime is 25218019. The next prime is 25218031. The reversal of 25218029 is 92081252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25020004 + 198025 = 5002^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 25218029 - 2⁴ = 25218013 is a prime.

Together with 25218031, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25217992 and 25218010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25218019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12609014 + 12609015.

It is an arithmetic number, because the mean of its divisors is an integer number (12609015).

Almost surely, 2^25218029 is an apocalyptic number.

It is an amenable number.

25218029 is a deficient number, since it is larger than the sum of its proper divisors (1).

25218029 is an equidigital number, since it uses as much as digits as its factorization.

25218029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 25218029 is about 5021.7555695195. The cubic root of 25218029 is about 293.2493422005.

It can be divided in two parts, 252 and 18029, that added together give a palindrome (18281).

The spelling of 25218029 in words is "twenty-five million, two hundred eighteen thousand, twenty-nine".