768461521 has 2 divisors, whose sum is σ = 768461522. Its totient is φ = 768461520.

The previous prime is 768461513. The next prime is 768461531. The reversal of 768461521 is 125164867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 755645121 + 12816400 = 27489^2 + 3580^2 .

It is a cyclic number.

It is not a de Polignac number, because 768461521 - 2³ = 768461513 is a prime.

It is not a weakly prime, because it can be changed into another prime (768461531) 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 as a sum of consecutive naturals, namely, 384230760 + 384230761.

It is an arithmetic number, because the mean of its divisors is an integer number (384230761).

Almost surely, 2^768461521 is an apocalyptic number.

It is an amenable number.

768461521 is a deficient number, since it is larger than the sum of its proper divisors (1).

768461521 is an equidigital number, since it uses as much as digits as its factorization.

768461521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 768461521 is about 27721.1385227952. The cubic root of 768461521 is about 915.9547981642.

The spelling of 768461521 in words is "seven hundred sixty-eight million, four hundred sixty-one thousand, five hundred twenty-one".