771121913 has 4 divisors (see below), whose sum is σ = 771532020. Its totient is φ = 770711808.

The previous prime is 771121909. The next prime is 771121933. The reversal of 771121913 is 319121177.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 595506409 + 175615504 = 24403^2 + 13252^2 .

It is a cyclic number.

It is not a de Polignac number, because 771121913 - 2² = 771121909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 771121913.

It is not an unprimeable number, because it can be changed into a prime (771121933) 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 in 3 ways as a sum of consecutive naturals, for example, 202220 + ... + 205997.

It is an arithmetic number, because the mean of its divisors is an integer number (192883005).

Almost surely, 2^771121913 is an apocalyptic number.

It is an amenable number.

771121913 is a deficient number, since it is larger than the sum of its proper divisors (410107).

771121913 is a wasteful number, since it uses less digits than its factorization.

771121913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410106.

The product of its digits is 2646, while the sum is 32.

The square root of 771121913 is about 27769.0819617790. The cubic root of 771121913 is about 917.0105839145.

The spelling of 771121913 in words is "seven hundred seventy-one million, one hundred twenty-one thousand, nine hundred thirteen".