249127706857 has 2 divisors, whose sum is σ = 249127706858. Its totient is φ = 249127706856.

The previous prime is 249127706851. The next prime is 249127706873. The reversal of 249127706857 is 758607721942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248702687401 + 425019456 = 498701^2 + 20616^2 .

It is a cyclic number.

It is not a de Polignac number, because 249127706857 - 2²³ = 249119318249 is a prime.

It is a super-2 number, since 2×249127706857² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249127706851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124563853428 + 124563853429.

It is an arithmetic number, because the mean of its divisors is an integer number (124563853429).

Almost surely, 2^249127706857 is an apocalyptic number.

It is an amenable number.

249127706857 is a deficient number, since it is larger than the sum of its proper divisors (1).

249127706857 is an equidigital number, since it uses as much as digits as its factorization.

249127706857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11854080, while the sum is 58.

The spelling of 249127706857 in words is "two hundred forty-nine billion, one hundred twenty-seven million, seven hundred six thousand, eight hundred fifty-seven".