25217431 has 2 divisors, whose sum is σ = 25217432. Its totient is φ = 25217430.

The previous prime is 25217417. The next prime is 25217447. The reversal of 25217431 is 13471252.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25217431 - 2⁷ = 25217303 is a prime.

It is a super-2 number, since 2×25217431² = 1271837652479522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25217396 and 25217405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25257431) 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, 12608715 + 12608716.

It is an arithmetic number, because the mean of its divisors is an integer number (12608716).

Almost surely, 2^25217431 is an apocalyptic number.

25217431 is a deficient number, since it is larger than the sum of its proper divisors (1).

25217431 is an equidigital number, since it uses as much as digits as its factorization.

25217431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 25.

The square root of 25217431 is about 5021.6960282359. The cubic root of 25217431 is about 293.2470242228.

Adding to 25217431 its reverse (13471252), we get a palindrome (38688683).

It can be divided in two parts, 2521743 and 1, that added together give a square (2521744 = 1588²).

The spelling of 25217431 in words is "twenty-five million, two hundred seventeen thousand, four hundred thirty-one".