265520401 has 4 divisors (see below), whose sum is σ = 265571892. Its totient is φ = 265468912.

The previous prime is 265520377. The next prime is 265520417. The reversal of 265520401 is 104025562.

265520401 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.

It can be written as a sum of positive squares in 2 ways, for example, as 214769025 + 50751376 = 14655^2 + 7124^2 .

It is a cyclic number.

It is not a de Polignac number, because 265520401 - 2⁷ = 265520273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265520461) 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, 17026 + ... + 28651.

It is an arithmetic number, because the mean of its divisors is an integer number (66392973).

Almost surely, 2^265520401 is an apocalyptic number.

It is an amenable number.

265520401 is a deficient number, since it is larger than the sum of its proper divisors (51491).

265520401 is an equidigital number, since it uses as much as digits as its factorization.

265520401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51490.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 265520401 is about 16294.7967462009. The cubic root of 265520401 is about 642.7360090233.

Adding to 265520401 its reverse (104025562), we get a palindrome (369545963).

The spelling of 265520401 in words is "two hundred sixty-five million, five hundred twenty thousand, four hundred one".