249945671 has 8 divisors (see below), whose sum is σ = 257746944. Its totient is φ = 242247960.

The previous prime is 249945643. The next prime is 249945673. The reversal of 249945671 is 176549942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249945671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249945673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20975 + ... + 30656.

It is an arithmetic number, because the mean of its divisors is an integer number (32218368).

Almost surely, 2^249945671 is an apocalyptic number.

249945671 is a deficient number, since it is larger than the sum of its proper divisors (7801273).

249945671 is a wasteful number, since it uses less digits than its factorization.

249945671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51781.

The product of its digits is 544320, while the sum is 47.

The square root of 249945671 is about 15809.6701736627. The cubic root of 249945671 is about 629.9148881409.

The spelling of 249945671 in words is "two hundred forty-nine million, nine hundred forty-five thousand, six hundred seventy-one".