771740647 has 2 divisors, whose sum is σ = 771740648. Its totient is φ = 771740646.

The previous prime is 771740623. The next prime is 771740681. The reversal of 771740647 is 746047177.

It is a weak prime.

It is an emirp because it is prime and its reverse (746047177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 771740647 - 2¹⁵ = 771707879 is a prime.

It is equal to p_39766138 and since 771740647 and 39766138 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (771740617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385870323 + 385870324.

It is an arithmetic number, because the mean of its divisors is an integer number (385870324).

Almost surely, 2^771740647 is an apocalyptic number.

771740647 is a deficient number, since it is larger than the sum of its proper divisors (1).

771740647 is an equidigital number, since it uses as much as digits as its factorization.

771740647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 230496, while the sum is 43.

The square root of 771740647 is about 27780.2204274912. The cubic root of 771740647 is about 917.2557824715.

The spelling of 771740647 in words is "seven hundred seventy-one million, seven hundred forty thousand, six hundred forty-seven".