249778049 has 2 divisors, whose sum is σ = 249778050. Its totient is φ = 249778048.

The previous prime is 249778033. The next prime is 249778079. The reversal of 249778049 is 940877942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243984400 + 5793649 = 15620^2 + 2407^2 .

It is a cyclic number.

It is not a de Polignac number, because 249778049 - 2⁴ = 249778033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249777988 and 249778006.

It is not a weakly prime, because it can be changed into another prime (249778079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124889024 + 124889025.

It is an arithmetic number, because the mean of its divisors is an integer number (124889025).

Almost surely, 2^249778049 is an apocalyptic number.

It is an amenable number.

249778049 is a deficient number, since it is larger than the sum of its proper divisors (1).

249778049 is an equidigital number, since it uses as much as digits as its factorization.

249778049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 249778049 is about 15804.3680354515. The cubic root of 249778049 is about 629.7740425920.

The spelling of 249778049 in words is "two hundred forty-nine million, seven hundred seventy-eight thousand, forty-nine".