769011981 has 4 divisors (see below), whose sum is σ = 1025349312. Its totient is φ = 512674652.

The previous prime is 769011977. The next prime is 769011989. The reversal of 769011981 is 189110967.

769011981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 769011981 - 2² = 769011977 is a prime.

It is a super-3 number, since 3×769011981³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (769011989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128168661 + ... + 128168666.

It is an arithmetic number, because the mean of its divisors is an integer number (256337328).

Almost surely, 2^769011981 is an apocalyptic number.

It is an amenable number.

769011981 is a deficient number, since it is larger than the sum of its proper divisors (256337331).

769011981 is a wasteful number, since it uses less digits than its factorization.

769011981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256337330.

The product of its (nonzero) digits is 27216, while the sum is 42.

The square root of 769011981 is about 27731.0652698377. The cubic root of 769011981 is about 916.1734498141.

The spelling of 769011981 in words is "seven hundred sixty-nine million, eleven thousand, nine hundred eighty-one".