249450391 has 2 divisors, whose sum is σ = 249450392. Its totient is φ = 249450390.

The previous prime is 249450389. The next prime is 249450451. The reversal of 249450391 is 193054942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249450391 - 2¹ = 249450389 is a prime.

Together with 249450389, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 249450391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249450361) 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 as a sum of consecutive naturals, namely, 124725195 + 124725196.

It is an arithmetic number, because the mean of its divisors is an integer number (124725196).

Almost surely, 2^249450391 is an apocalyptic number.

249450391 is a deficient number, since it is larger than the sum of its proper divisors (1).

249450391 is an equidigital number, since it uses as much as digits as its factorization.

249450391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 249450391 is about 15793.9985754083. The cubic root of 249450391 is about 629.4985436042.

The spelling of 249450391 in words is "two hundred forty-nine million, four hundred fifty thousand, three hundred ninety-one".