999971004257 has 2 divisors, whose sum is σ = 999971004258. Its totient is φ = 999971004256.

The previous prime is 999971004247. The next prime is 999971004271. The reversal of 999971004257 is 752400179999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 907743995536 + 92227008721 = 952756^2 + 303689^2 .

It is a cyclic number.

It is not a de Polignac number, because 999971004257 - 2¹⁶ = 999970938721 is a prime.

It is a super-2 number, since 2×999971004257² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999971004257.

It is not a weakly prime, because it can be changed into another prime (999971004247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499985502128 + 499985502129.

It is an arithmetic number, because the mean of its divisors is an integer number (499985502129).

Almost surely, 2^999971004257 is an apocalyptic number.

It is an amenable number.

999971004257 is a deficient number, since it is larger than the sum of its proper divisors (1).

999971004257 is an equidigital number, since it uses as much as digits as its factorization.

999971004257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12859560, while the sum is 62.

The spelling of 999971004257 in words is "nine hundred ninety-nine billion, nine hundred seventy-one million, four thousand, two hundred fifty-seven".