1971839349447 has 16 divisors (see below), whose sum is σ = 2868753283968. Its totient is φ = 1194794434080.

The previous prime is 1971839349427. The next prime is 1971839349461. The reversal of 1971839349447 is 7449439381791.

It is not a de Polignac number, because 1971839349447 - 2¹⁴ = 1971839333063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971839349427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6338728 + ... + 6642525.

It is an arithmetic number, because the mean of its divisors is an integer number (179297080248).

Almost surely, 2^{1971839349447} is an apocalyptic number.

1971839349447 is a deficient number, since it is larger than the sum of its proper divisors (896913934521).

1971839349447 is a wasteful number, since it uses less digits than its factorization.

1971839349447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12985870.

The product of its digits is 164602368, while the sum is 69.

The spelling of 1971839349447 in words is "one trillion, nine hundred seventy-one billion, eight hundred thirty-nine million, three hundred forty-nine thousand, four hundred forty-seven".