249041543 has 2 divisors, whose sum is σ = 249041544. Its totient is φ = 249041542.

The previous prime is 249041521. The next prime is 249041549. The reversal of 249041543 is 345140942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249041543 - 2¹⁴ = 249025159 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249041549) 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, 124520771 + 124520772.

It is an arithmetic number, because the mean of its divisors is an integer number (124520772).

Almost surely, 2^249041543 is an apocalyptic number.

249041543 is a deficient number, since it is larger than the sum of its proper divisors (1).

249041543 is an equidigital number, since it uses as much as digits as its factorization.

249041543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 249041543 is about 15781.0501234867. The cubic root of 249041543 is about 629.1544405053.

The spelling of 249041543 in words is "two hundred forty-nine million, forty-one thousand, five hundred forty-three".