25138543 has 4 divisors (see below), whose sum is σ = 25564680. Its totient is φ = 24712408.

The previous prime is 25138493. The next prime is 25138549. The reversal of 25138543 is 34583152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25138543 - 2¹³ = 25130351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25138549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212980 + ... + 213097.

It is an arithmetic number, because the mean of its divisors is an integer number (6391170).

Almost surely, 2^25138543 is an apocalyptic number.

25138543 is a deficient number, since it is larger than the sum of its proper divisors (426137).

25138543 is an equidigital number, since it uses as much as digits as its factorization.

25138543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426136.

The product of its digits is 14400, while the sum is 31.

The square root of 25138543 is about 5013.8351588380. The cubic root of 25138543 is about 292.9409153732.

The spelling of 25138543 in words is "twenty-five million, one hundred thirty-eight thousand, five hundred forty-three".