1971972991759 has 2 divisors, whose sum is σ = 1971972991760. Its totient is φ = 1971972991758.

The previous prime is 1971972991757. The next prime is 1971972991787. The reversal of 1971972991759 is 9571992791791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1971972991759 - 2¹ = 1971972991757 is a prime.

Together with 1971972991757, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971972991753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985986495879 + 985986495880.

It is an arithmetic number, because the mean of its divisors is an integer number (985986495880).

Almost surely, 2^{1971972991759} is an apocalyptic number.

1971972991759 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971972991759 is an equidigital number, since it uses as much as digits as its factorization.

1971972991759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 202538070, while the sum is 76.

The spelling of 1971972991759 in words is "one trillion, nine hundred seventy-one billion, nine hundred seventy-two million, nine hundred ninety-one thousand, seven hundred fifty-nine".