25507243 has 2 divisors, whose sum is σ = 25507244. Its totient is φ = 25507242.

The previous prime is 25507231. The next prime is 25507249. The reversal of 25507243 is 34270552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25507243 - 2²¹ = 23410091 is a prime.

It is a super-2 number, since 2×25507243² = 1301238890922098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25507249) 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, 12753621 + 12753622.

It is an arithmetic number, because the mean of its divisors is an integer number (12753622).

Almost surely, 2^25507243 is an apocalyptic number.

25507243 is a deficient number, since it is larger than the sum of its proper divisors (1).

25507243 is an equidigital number, since it uses as much as digits as its factorization.

25507243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 25507243 is about 5050.4695821280. The cubic root of 25507243 is about 294.3661310761.

Adding to 25507243 its reverse (34270552), we get a palindrome (59777795).

The spelling of 25507243 in words is "twenty-five million, five hundred seven thousand, two hundred forty-three".