9971492426989 has 2 divisors, whose sum is σ = 9971492426990. Its totient is φ = 9971492426988.

The previous prime is 9971492426923. The next prime is 9971492427031. The reversal of 9971492426989 is 9896242941799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7422546069225 + 2548946357764 = 2724435^2 + 1596542^2 .

It is a cyclic number.

It is not a de Polignac number, because 9971492426989 - 2¹¹ = 9971492424941 is a prime.

It is a super-2 number, since 2×9971492426989² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9971492436989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4985746213494 + 4985746213495.

It is an arithmetic number, because the mean of its divisors is an integer number (4985746213495).

Almost surely, 2^{9971492426989} is an apocalyptic number.

It is an amenable number.

9971492426989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9971492426989 is an equidigital number, since it uses as much as digits as its factorization.

9971492426989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1269789696, while the sum is 79.

The spelling of 9971492426989 in words is "nine trillion, nine hundred seventy-one billion, four hundred ninety-two million, four hundred twenty-six thousand, nine hundred eighty-nine".