25218031 has 2 divisors, whose sum is σ = 25218032. Its totient is φ = 25218030.

The previous prime is 25218029. The next prime is 25218041. The reversal of 25218031 is 13081252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25218031 - 2¹ = 25218029 is a prime.

It is a super-2 number, since 2×25218031² = 1271898175033922, which contains 22 as substring.

Together with 25218029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 25217993 and 25218011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25218041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12609015 + 12609016.

It is an arithmetic number, because the mean of its divisors is an integer number (12609016).

Almost surely, 2^25218031 is an apocalyptic number.

25218031 is a deficient number, since it is larger than the sum of its proper divisors (1).

25218031 is an equidigital number, since it uses as much as digits as its factorization.

25218031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 25218031 is about 5021.7557686530. The cubic root of 25218031 is about 293.2493499529.

Adding to 25218031 its reverse (13081252), we get a palindrome (38299283).

The spelling of 25218031 in words is "twenty-five million, two hundred eighteen thousand, thirty-one".