249638305247 has 4 divisors (see below), whose sum is σ = 264322911456. Its totient is φ = 234953699040.

The previous prime is 249638305219. The next prime is 249638305253. The reversal of 249638305247 is 742503836942.

It is a happy number.

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 249638305247 - 2⁸ = 249638304991 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 (249638301247) 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, 7342303079 + ... + 7342303112.

It is an arithmetic number, because the mean of its divisors is an integer number (66080727864).

Almost surely, 2^249638305247 is an apocalyptic number.

249638305247 is a deficient number, since it is larger than the sum of its proper divisors (14684606209).

249638305247 is a wasteful number, since it uses less digits than its factorization.

249638305247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14684606208.

The product of its (nonzero) digits is 8709120, while the sum is 53.

The spelling of 249638305247 in words is "two hundred forty-nine billion, six hundred thirty-eight million, three hundred five thousand, two hundred forty-seven".