249971 has 2 divisors, whose sum is σ = 249972. Its totient is φ = 249970.

The previous prime is 249967. The next prime is 249973. The reversal of 249971 is 179942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249971 - 2² = 249967 is a prime.

It is a Sophie Germain prime.

Together with 249973, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249971.

It is not a weakly prime, because it can be changed into another prime (249973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124985 + 124986.

It is an arithmetic number, because the mean of its divisors is an integer number (124986).

2²⁴⁹⁹⁷¹ is an apocalyptic number.

249971 is a deficient number, since it is larger than the sum of its proper divisors (1).

249971 is an equidigital number, since it uses as much as digits as its factorization.

249971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 249971 is about 499.9709991590. The cubic root of 249971 is about 62.9936165532.

The spelling of 249971 in words is "two hundred forty-nine thousand, nine hundred seventy-one".