249997271 has 4 divisors (see below), whose sum is σ = 256753992. Its totient is φ = 243240552.

The previous prime is 249997249. The next prime is 249997273. The reversal of 249997271 is 172799942.

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-249997271 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 (249997273) 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, 3378305 + ... + 3378378.

It is an arithmetic number, because the mean of its divisors is an integer number (64188498).

Almost surely, 2^249997271 is an apocalyptic number.

249997271 is a deficient number, since it is larger than the sum of its proper divisors (6756721).

249997271 is an equidigital number, since it uses as much as digits as its factorization.

249997271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6756720.

The product of its digits is 571536, while the sum is 50.

The square root of 249997271 is about 15811.3020020490. The cubic root of 249997271 is about 629.9582327227.

The spelling of 249997271 in words is "two hundred forty-nine million, nine hundred ninety-seven thousand, two hundred seventy-one".