249666943 has 4 divisors (see below), whose sum is σ = 249879528. Its totient is φ = 249454360.

The previous prime is 249666877. The next prime is 249667013. The reversal of 249666943 is 349666942.

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 249666943 - 2¹³ = 249658751 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 (249661943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104521 + ... + 106882.

It is an arithmetic number, because the mean of its divisors is an integer number (62469882).

Almost surely, 2^249666943 is an apocalyptic number.

249666943 is a deficient number, since it is larger than the sum of its proper divisors (212585).

249666943 is a wasteful number, since it uses less digits than its factorization.

249666943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212584.

The product of its digits is 1679616, while the sum is 49.

The square root of 249666943 is about 15800.8526035781. The cubic root of 249666943 is about 629.6806502749.

Subtracting 249666943 from its reverse (349666942), we obtain a palindrome (99999999).

The spelling of 249666943 in words is "two hundred forty-nine million, six hundred sixty-six thousand, nine hundred forty-three".