766241521 has 2 divisors, whose sum is σ = 766241522. Its totient is φ = 766241520.

The previous prime is 766241491. The next prime is 766241569. The reversal of 766241521 is 125142667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 536385600 + 229855921 = 23160^2 + 15161^2 .

It is a cyclic number.

It is not a de Polignac number, because 766241521 - 2¹⁵ = 766208753 is a prime.

It is not a weakly prime, because it can be changed into another prime (766641521) 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 as a sum of consecutive naturals, namely, 383120760 + 383120761.

It is an arithmetic number, because the mean of its divisors is an integer number (383120761).

Almost surely, 2^766241521 is an apocalyptic number.

It is an amenable number.

766241521 is a deficient number, since it is larger than the sum of its proper divisors (1).

766241521 is an equidigital number, since it uses as much as digits as its factorization.

766241521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 766241521 is about 27681.0679165382. The cubic root of 766241521 is about 915.0719168692.

The spelling of 766241521 in words is "seven hundred sixty-six million, two hundred forty-one thousand, five hundred twenty-one".