771378073 has 2 divisors, whose sum is σ = 771378074. Its totient is φ = 771378072.

The previous prime is 771378011. The next prime is 771378133. The reversal of 771378073 is 370873177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 747092889 + 24285184 = 27333^2 + 4928^2 .

It is an emirp because it is prime and its reverse (370873177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 771378073 - 2²¹ = 769280921 is a prime.

It is not a weakly prime, because it can be changed into another prime (771378373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385689036 + 385689037.

It is an arithmetic number, because the mean of its divisors is an integer number (385689037).

Almost surely, 2^771378073 is an apocalyptic number.

It is an amenable number.

771378073 is a deficient number, since it is larger than the sum of its proper divisors (1).

771378073 is an equidigital number, since it uses as much as digits as its factorization.

771378073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172872, while the sum is 43.

The square root of 771378073 is about 27773.6939026842. The cubic root of 771378073 is about 917.1121136559.

The spelling of 771378073 in words is "seven hundred seventy-one million, three hundred seventy-eight thousand, seventy-three".