9971001457 has 2 divisors, whose sum is σ = 9971001458. Its totient is φ = 9971001456.

The previous prime is 9971001427. The next prime is 9971001497. The reversal of 9971001457 is 7541001799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8484436321 + 1486565136 = 92111^2 + 38556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9971001457 is a prime.

It is a super-2 number, since 2×9971001457² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9971001407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4985500728 + 4985500729.

It is an arithmetic number, because the mean of its divisors is an integer number (4985500729).

Almost surely, 2^9971001457 is an apocalyptic number.

It is an amenable number.

9971001457 is a deficient number, since it is larger than the sum of its proper divisors (1).

9971001457 is an equidigital number, since it uses as much as digits as its factorization.

9971001457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 43.

The square root of 9971001457 is about 99854.9020178779. The cubic root of 9971001457 is about 2152.3501582187.

The spelling of 9971001457 in words is "nine billion, nine hundred seventy-one million, one thousand, four hundred fifty-seven".