764205121 has 2 divisors, whose sum is σ = 764205122. Its totient is φ = 764205120.

The previous prime is 764205119. The next prime is 764205151. The reversal of 764205121 is 121502467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 759774096 + 4431025 = 27564^2 + 2105^2 .

It is a cyclic number.

It is not a de Polignac number, because 764205121 - 2¹ = 764205119 is a prime.

Together with 764205119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 764205121.

It is not a weakly prime, because it can be changed into another prime (764205151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382102560 + 382102561.

It is an arithmetic number, because the mean of its divisors is an integer number (382102561).

Almost surely, 2^764205121 is an apocalyptic number.

It is an amenable number.

764205121 is a deficient number, since it is larger than the sum of its proper divisors (1).

764205121 is an equidigital number, since it uses as much as digits as its factorization.

764205121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 764205121 is about 27644.2601818171. The cubic root of 764205121 is about 914.2605514175.

Adding to 764205121 its reverse (121502467), we get a palindrome (885707588).

The spelling of 764205121 in words is "seven hundred sixty-four million, two hundred five thousand, one hundred twenty-one".