771456641 has 2 divisors, whose sum is σ = 771456642. Its totient is φ = 771456640.

The previous prime is 771456613. The next prime is 771456643. The reversal of 771456641 is 146654177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391050625 + 380406016 = 19775^2 + 19504^2 .

It is a cyclic number.

It is not a de Polignac number, because 771456641 - 2¹⁰ = 771455617 is a prime.

Together with 771456643, 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 (771456643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385728320 + 385728321.

It is an arithmetic number, because the mean of its divisors is an integer number (385728321).

Almost surely, 2^771456641 is an apocalyptic number.

It is an amenable number.

771456641 is a deficient number, since it is larger than the sum of its proper divisors (1).

771456641 is an equidigital number, since it uses as much as digits as its factorization.

771456641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 41.

The square root of 771456641 is about 27775.1082986187. The cubic root of 771456641 is about 917.1432498008.

The spelling of 771456641 in words is "seven hundred seventy-one million, four hundred fifty-six thousand, six hundred forty-one".