756723521 has 2 divisors, whose sum is σ = 756723522. Its totient is φ = 756723520.

The previous prime is 756723493. The next prime is 756723551. The reversal of 756723521 is 125327657.

756723521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 701667121 + 55056400 = 26489^2 + 7420^2 .

It is a cyclic number.

It is not a de Polignac number, because 756723521 - 2¹⁰ = 756722497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (756723551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 378361760 + 378361761.

It is an arithmetic number, because the mean of its divisors is an integer number (378361761).

Almost surely, 2^756723521 is an apocalyptic number.

It is an amenable number.

756723521 is a deficient number, since it is larger than the sum of its proper divisors (1).

756723521 is an equidigital number, since it uses as much as digits as its factorization.

756723521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 38.

The square root of 756723521 is about 27508.6081254577. The cubic root of 756723521 is about 911.2672121155.

The spelling of 756723521 in words is "seven hundred fifty-six million, seven hundred twenty-three thousand, five hundred twenty-one".