265320521 has 4 divisors (see below), whose sum is σ = 265487232. Its totient is φ = 265153812.

The previous prime is 265320493. The next prime is 265320529. The reversal of 265320521 is 125023562.

265320521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125023562 = 2 ⋅62511781.

It is a cyclic number.

It is not a de Polignac number, because 265320521 - 2¹⁰ = 265319497 is a prime.

It is a super-2 number, since 2×265320521² = 140789957727422882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265320529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80945 + ... + 84158.

It is an arithmetic number, because the mean of its divisors is an integer number (66371808).

Almost surely, 2^265320521 is an apocalyptic number.

It is an amenable number.

265320521 is a deficient number, since it is larger than the sum of its proper divisors (166711).

265320521 is a wasteful number, since it uses less digits than its factorization.

265320521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166710.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 265320521 is about 16288.6623453247. The cubic root of 265320521 is about 642.5746876794.

The spelling of 265320521 in words is "two hundred sixty-five million, three hundred twenty thousand, five hundred twenty-one".