25540043 has 2 divisors, whose sum is σ = 25540044. Its totient is φ = 25540042.

The previous prime is 25540037. The next prime is 25540061. The reversal of 25540043 is 34004552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25540043 - 2²⁴ = 8762827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25540033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12770021 + 12770022.

It is an arithmetic number, because the mean of its divisors is an integer number (12770022).

Almost surely, 2^25540043 is an apocalyptic number.

25540043 is a deficient number, since it is larger than the sum of its proper divisors (1).

25540043 is an equidigital number, since it uses as much as digits as its factorization.

25540043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 25540043 is about 5053.7157616946. The cubic root of 25540043 is about 294.4922530758.

Adding to 25540043 its reverse (34004552), we get a palindrome (59544595).

The spelling of 25540043 in words is "twenty-five million, five hundred forty thousand, forty-three".