43688247271391 has 2 divisors, whose sum is σ = 43688247271392. Its totient is φ = 43688247271390.

The previous prime is 43688247271381. The next prime is 43688247271421. The reversal of 43688247271391 is 19317274288634.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43688247271391 - 2¹⁴ = 43688247255007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43688247271381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21844123635695 + 21844123635696.

It is an arithmetic number, because the mean of its divisors is an integer number (21844123635696).

Almost surely, 2^{43688247271391} is an apocalyptic number.

43688247271391 is a deficient number, since it is larger than the sum of its proper divisors (1).

43688247271391 is an equidigital number, since it uses as much as digits as its factorization.

43688247271391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97542144, while the sum is 65.

The spelling of 43688247271391 in words is "forty-three trillion, six hundred eighty-eight billion, two hundred forty-seven million, two hundred seventy-one thousand, three hundred ninety-one".