71783791 has 2 divisors, whose sum is σ = 71783792. Its totient is φ = 71783790.

The previous prime is 71783779. The next prime is 71783797. The reversal of 71783791 is 19738717.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71783791 - 2⁹ = 71783279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71783797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35891895 + 35891896.

It is an arithmetic number, because the mean of its divisors is an integer number (35891896).

Almost surely, 2^71783791 is an apocalyptic number.

71783791 is a deficient number, since it is larger than the sum of its proper divisors (1).

71783791 is an equidigital number, since it uses as much as digits as its factorization.

71783791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 43.

The square root of 71783791 is about 8472.5315579229. The cubic root of 71783791 is about 415.5999277920.

The spelling of 71783791 in words is "seventy-one million, seven hundred eighty-three thousand, seven hundred ninety-one".