25390531 has 2 divisors, whose sum is σ = 25390532. Its totient is φ = 25390530.

The previous prime is 25390529. The next prime is 25390549. The reversal of 25390531 is 13509352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25390531 - 2¹ = 25390529 is a prime.

It is a super-2 number, since 2×25390531² = 1289358128923922, which contains 22 as substring.

Together with 25390529, it forms a pair of twin primes.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 25390531.

It is not a weakly prime, because it can be changed into another prime (25390031) 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, 12695265 + 12695266.

It is an arithmetic number, because the mean of its divisors is an integer number (12695266).

Almost surely, 2^25390531 is an apocalyptic number.

25390531 is a deficient number, since it is larger than the sum of its proper divisors (1).

25390531 is an equidigital number, since it uses as much as digits as its factorization.

25390531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 25390531 is about 5038.9017652659. The cubic root of 25390531 is about 293.9164732562.

Adding to 25390531 its reverse (13509352), we get a palindrome (38899883).

It can be divided in two parts, 25390 and 531, that added together give a square (25921 = 161²).

The spelling of 25390531 in words is "twenty-five million, three hundred ninety thousand, five hundred thirty-one".