249139148569 has 2 divisors, whose sum is σ = 249139148570. Its totient is φ = 249139148568.

The previous prime is 249139148507. The next prime is 249139148579. The reversal of 249139148569 is 965841931942.

249139148569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222984172944 + 26154975625 = 472212^2 + 161725^2 .

It is a cyclic number.

It is not a de Polignac number, because 249139148569 - 2¹³ = 249139140377 is a prime.

It is a super-2 number, since 2×249139148569² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249139148579) 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, 124569574284 + 124569574285.

It is an arithmetic number, because the mean of its divisors is an integer number (124569574285).

Almost surely, 2^249139148569 is an apocalyptic number.

It is an amenable number.

249139148569 is a deficient number, since it is larger than the sum of its proper divisors (1).

249139148569 is an equidigital number, since it uses as much as digits as its factorization.

249139148569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16796160, while the sum is 61.

The spelling of 249139148569 in words is "two hundred forty-nine billion, one hundred thirty-nine million, one hundred forty-eight thousand, five hundred sixty-nine".