391249 has 2 divisors, whose sum is σ = 391250. Its totient is φ = 391248.

The previous prime is 391247. The next prime is 391273. The reversal of 391249 is 942193.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219024 + 172225 = 468^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 391249 - 2¹ = 391247 is a prime.

Together with 391247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (391247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195624 + 195625.

It is an arithmetic number, because the mean of its divisors is an integer number (195625).

2³⁹¹²⁴⁹ is an apocalyptic number.

It is an amenable number.

391249 is a deficient number, since it is larger than the sum of its proper divisors (1).

391249 is an equidigital number, since it uses as much as digits as its factorization.

391249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 28.

The square root of 391249 is about 625.4990007986. The cubic root of 391249 is about 73.1393472713.

The spelling of 391249 in words is "three hundred ninety-one thousand, two hundred forty-nine".