249173143 has 4 divisors (see below), whose sum is σ = 249222040. Its totient is φ = 249124248.

The previous prime is 249173129. The next prime is 249173153. The reversal of 249173143 is 341371942.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249173143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249173099 and 249173108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249173123) 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, 15780 + ... + 27337.

It is an arithmetic number, because the mean of its divisors is an integer number (62305510).

Almost surely, 2^249173143 is an apocalyptic number.

249173143 is a deficient number, since it is larger than the sum of its proper divisors (48897).

249173143 is an equidigital number, since it uses as much as digits as its factorization.

249173143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48896.

The product of its digits is 18144, while the sum is 34.

The square root of 249173143 is about 15785.2191305664. The cubic root of 249173143 is about 629.2652414901.

The spelling of 249173143 in words is "two hundred forty-nine million, one hundred seventy-three thousand, one hundred forty-three".