772056521 has 2 divisors, whose sum is σ = 772056522. Its totient is φ = 772056520.

The previous prime is 772056517. The next prime is 772056557. The reversal of 772056521 is 125650277.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645718921 + 126337600 = 25411^2 + 11240^2 .

It is an emirp because it is prime and its reverse (125650277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 772056521 - 2² = 772056517 is a prime.

It is not a weakly prime, because it can be changed into another prime (772016521) 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, 386028260 + 386028261.

It is an arithmetic number, because the mean of its divisors is an integer number (386028261).

Almost surely, 2^772056521 is an apocalyptic number.

It is an amenable number.

772056521 is a deficient number, since it is larger than the sum of its proper divisors (1).

772056521 is an equidigital number, since it uses as much as digits as its factorization.

772056521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 772056521 is about 27785.9050779347. The cubic root of 772056521 is about 917.3809098845.

The spelling of 772056521 in words is "seven hundred seventy-two million, fifty-six thousand, five hundred twenty-one".