999999999743971 has 2 divisors, whose sum is σ = 999999999743972. Its totient is φ = 999999999743970.

The previous prime is 999999999743903. The next prime is 999999999744061. The reversal of 999999999743971 is 179347999999999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999999999743971 - 2¹⁷ = 999999999612899 is a prime.

It is not a weakly prime, because it can be changed into another prime (999999999743671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999999871985 + 499999999871986.

It is an arithmetic number, because the mean of its divisors is an integer number (499999999871986).

Almost surely, 2^{999999999743971} is an apocalyptic number.

999999999743971 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999999743971 is an equidigital number, since it uses as much as digits as its factorization.

999999999743971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2050229227788, while the sum is 112.

The spelling of 999999999743971 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, seven hundred forty-three thousand, nine hundred seventy-one".