773125021 has 2 divisors, whose sum is σ = 773125022. Its totient is φ = 773125020.

The previous prime is 773125019. The next prime is 773125037. The reversal of 773125021 is 120521377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556299396 + 216825625 = 23586^2 + 14725^2 .

It is an emirp because it is prime and its reverse (120521377) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 773125021 - 2¹ = 773125019 is a prime.

Together with 773125019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (773125051) 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, 386562510 + 386562511.

It is an arithmetic number, because the mean of its divisors is an integer number (386562511).

Almost surely, 2^773125021 is an apocalyptic number.

It is an amenable number.

773125021 is a deficient number, since it is larger than the sum of its proper divisors (1).

773125021 is an equidigital number, since it uses as much as digits as its factorization.

773125021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 773125021 is about 27805.1258044268. The cubic root of 773125021 is about 917.8039228053.

Adding to 773125021 its reverse (120521377), we get a palindrome (893646398).

The spelling of 773125021 in words is "seven hundred seventy-three million, one hundred twenty-five thousand, twenty-one".