771246961 has 4 divisors (see below), whose sum is σ = 771521652. Its totient is φ = 770972272.

The previous prime is 771246929. The next prime is 771246979. The reversal of 771246961 is 169642177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169642177 = 2441 ⋅69497.

It can be written as a sum of positive squares in 2 ways, for example, as 22896225 + 748350736 = 4785^2 + 27356^2 .

It is a cyclic number.

It is not a de Polignac number, because 771246961 - 2⁵ = 771246929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (771246061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133090 + ... + 138763.

It is an arithmetic number, because the mean of its divisors is an integer number (192880413).

Almost surely, 2^771246961 is an apocalyptic number.

It is an amenable number.

771246961 is a deficient number, since it is larger than the sum of its proper divisors (274691).

771246961 is a wasteful number, since it uses less digits than its factorization.

771246961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274690.

The product of its digits is 127008, while the sum is 43.

The square root of 771246961 is about 27771.3334393579. Note that the first 3 decimals coincide. The cubic root of 771246961 is about 917.0601498520.

The spelling of 771246961 in words is "seven hundred seventy-one million, two hundred forty-six thousand, nine hundred sixty-one".