771680369 has 2 divisors, whose sum is σ = 771680370. Its totient is φ = 771680368.

The previous prime is 771680363. The next prime is 771680417. The reversal of 771680369 is 963086177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 704637025 + 67043344 = 26545^2 + 8188^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-771680369 is a prime.

It is a super-2 number, since 2×771680369² = 1190981183799952322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (771680363) 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, 385840184 + 385840185.

It is an arithmetic number, because the mean of its divisors is an integer number (385840185).

Almost surely, 2^771680369 is an apocalyptic number.

It is an amenable number.

771680369 is a deficient number, since it is larger than the sum of its proper divisors (1).

771680369 is an equidigital number, since it uses as much as digits as its factorization.

771680369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 771680369 is about 27779.1354977076. The cubic root of 771680369 is about 917.2319006213.

The spelling of 771680369 in words is "seven hundred seventy-one million, six hundred eighty thousand, three hundred sixty-nine".