25172431 has 2 divisors, whose sum is σ = 25172432. Its totient is φ = 25172430.

The previous prime is 25172429. The next prime is 25172437. The reversal of 25172431 is 13427152.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25172431 - 2¹ = 25172429 is a prime.

It is a super-2 number, since 2×25172431² = 1267302564899522, which contains 22 as substring.

Together with 25172429, it forms a pair of twin primes.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 25172396 and 25172405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25172437) 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, 12586215 + 12586216.

It is an arithmetic number, because the mean of its divisors is an integer number (12586216).

Almost surely, 2^25172431 is an apocalyptic number.

25172431 is a deficient number, since it is larger than the sum of its proper divisors (1).

25172431 is an equidigital number, since it uses as much as digits as its factorization.

25172431 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 25172431 is about 5017.2134696463. The cubic root of 25172431 is about 293.0724892185.

Adding to 25172431 its reverse (13427152), we get a palindrome (38599583).

The spelling of 25172431 in words is "twenty-five million, one hundred seventy-two thousand, four hundred thirty-one".