971999999999999 has 2 divisors, whose sum is σ = 972000000000000. Its totient is φ = 971999999999998.

The previous prime is 971999999999983. The next prime is 972000000000079. The reversal of 971999999999999 is 999999999999179.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 971999999999999 - 2⁴ = 971999999999983 is a prime.

It is a super-9 number, since 9×971999999999999⁹ (a number of 136 digits) contains 999999999 as substring.

971999999999999 is a modest number, since divided by 99999999 gives 9719999 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971999999999099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485999999999999 + 486000000000000.

It is an arithmetic number, because the mean of its divisors is an integer number (486000000000000).

Almost surely, 2^{971999999999999} is an apocalyptic number.

971999999999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

971999999999999 is an equidigital number, since it uses as much as digits as its factorization.

971999999999999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17793060798303, while the sum is 125.

The spelling of 971999999999999 in words is "nine hundred seventy-one trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".