791743681 has 2 divisors, whose sum is σ = 791743682. Its totient is φ = 791743680.

The previous prime is 791743679. The next prime is 791743691. The reversal of 791743681 is 186347197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635493681 + 156250000 = 25209^2 + 12500^2 .

It is an emirp because it is prime and its reverse (186347197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 791743681 - 2¹ = 791743679 is a prime.

It is a super-2 number, since 2×791743681² = 1253716112806859522, which contains 22 as substring.

Together with 791743679, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (791743691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395871840 + 395871841.

It is an arithmetic number, because the mean of its divisors is an integer number (395871841).

Almost surely, 2^791743681 is an apocalyptic number.

It is an amenable number.

791743681 is a deficient number, since it is larger than the sum of its proper divisors (1).

791743681 is an equidigital number, since it uses as much as digits as its factorization.

791743681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 791743681 is about 28137.9402408918. The cubic root of 791743681 is about 925.1131805995.

The spelling of 791743681 in words is "seven hundred ninety-one million, seven hundred forty-three thousand, six hundred eighty-one".