249215248549 has 2 divisors, whose sum is σ = 249215248550. Its totient is φ = 249215248548.

The previous prime is 249215248519. The next prime is 249215248561. The reversal of 249215248549 is 945842512942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146650702500 + 102564546049 = 382950^2 + 320257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249215248549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249215248549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249215248519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124607624274 + 124607624275.

It is an arithmetic number, because the mean of its divisors is an integer number (124607624275).

Almost surely, 2^249215248549 is an apocalyptic number.

It is an amenable number.

249215248549 is a deficient number, since it is larger than the sum of its proper divisors (1).

249215248549 is an equidigital number, since it uses as much as digits as its factorization.

249215248549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8294400, while the sum is 55.

The spelling of 249215248549 in words is "two hundred forty-nine billion, two hundred fifteen million, two hundred forty-eight thousand, five hundred forty-nine".