265728521 has 2 divisors, whose sum is σ = 265728522. Its totient is φ = 265728520.

The previous prime is 265728517. The next prime is 265728539. The reversal of 265728521 is 125827562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263737600 + 1990921 = 16240^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 265728521 - 2² = 265728517 is a prime.

It is a super-2 number, since 2×265728521² = 141223293745694882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (265728571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132864260 + 132864261.

It is an arithmetic number, because the mean of its divisors is an integer number (132864261).

Almost surely, 2^265728521 is an apocalyptic number.

It is an amenable number.

265728521 is a deficient number, since it is larger than the sum of its proper divisors (1).

265728521 is an equidigital number, since it uses as much as digits as its factorization.

265728521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

The square root of 265728521 is about 16301.1815829405. The cubic root of 265728521 is about 642.9038947845.

The spelling of 265728521 in words is "two hundred sixty-five million, seven hundred twenty-eight thousand, five hundred twenty-one".