249668143 has 2 divisors, whose sum is σ = 249668144. Its totient is φ = 249668142.

The previous prime is 249668093. The next prime is 249668149. The reversal of 249668143 is 341866942.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249668143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249668143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249668149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124834071 + 124834072.

It is an arithmetic number, because the mean of its divisors is an integer number (124834072).

Almost surely, 2^249668143 is an apocalyptic number.

249668143 is a deficient number, since it is larger than the sum of its proper divisors (1).

249668143 is an equidigital number, since it uses as much as digits as its factorization.

249668143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 43.

The square root of 249668143 is about 15800.8905761669. The cubic root of 249668143 is about 629.6816591063.

The spelling of 249668143 in words is "two hundred forty-nine million, six hundred sixty-eight thousand, one hundred forty-three".