766936921 has 2 divisors, whose sum is σ = 766936922. Its totient is φ = 766936920.

The previous prime is 766936901. The next prime is 766936991. The reversal of 766936921 is 129639667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 503329225 + 263607696 = 22435^2 + 16236^2 .

It is a cyclic number.

It is not a de Polignac number, because 766936921 - 2⁹ = 766936409 is a prime.

It is not a weakly prime, because it can be changed into another prime (766936901) 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, 383468460 + 383468461.

It is an arithmetic number, because the mean of its divisors is an integer number (383468461).

Almost surely, 2^766936921 is an apocalyptic number.

It is an amenable number.

766936921 is a deficient number, since it is larger than the sum of its proper divisors (1).

766936921 is an equidigital number, since it uses as much as digits as its factorization.

766936921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 49.

The square root of 766936921 is about 27693.6259994967. The cubic root of 766936921 is about 915.3486566818.

The spelling of 766936921 in words is "seven hundred sixty-six million, nine hundred thirty-six thousand, nine hundred twenty-one".