249378841 has 2 divisors, whose sum is σ = 249378842. Its totient is φ = 249378840.

The previous prime is 249378839. The next prime is 249378869. The reversal of 249378841 is 148873942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152769600 + 96609241 = 12360^2 + 9829^2 .

It is a cyclic number.

It is not a de Polignac number, because 249378841 - 2¹ = 249378839 is a prime.

Together with 249378839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 249378791 and 249378800.

It is not a weakly prime, because it can be changed into another prime (249378881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124689420 + 124689421.

It is an arithmetic number, because the mean of its divisors is an integer number (124689421).

Almost surely, 2^249378841 is an apocalyptic number.

It is an amenable number.

249378841 is a deficient number, since it is larger than the sum of its proper divisors (1).

249378841 is an equidigital number, since it uses as much as digits as its factorization.

249378841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 249378841 is about 15791.7333120845. The cubic root of 249378841 is about 629.4383513716.

The spelling of 249378841 in words is "two hundred forty-nine million, three hundred seventy-eight thousand, eight hundred forty-one".