265521601 has 2 divisors, whose sum is σ = 265521602. Its totient is φ = 265521600.

The previous prime is 265521577. The next prime is 265521629. The reversal of 265521601 is 106125562.

It is an a-pointer prime, because the next prime (265521629) can be obtained adding 265521601 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203490225 + 62031376 = 14265^2 + 7876^2 .

It is a cyclic number.

It is not a de Polignac number, because 265521601 - 2⁵ = 265521569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 265521601.

It is not a weakly prime, because it can be changed into another prime (265521661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132760800 + 132760801.

It is an arithmetic number, because the mean of its divisors is an integer number (132760801).

Almost surely, 2^265521601 is an apocalyptic number.

It is an amenable number.

265521601 is a deficient number, since it is larger than the sum of its proper divisors (1).

265521601 is an equidigital number, since it uses as much as digits as its factorization.

265521601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 265521601 is about 16294.8335677294. The cubic root of 265521601 is about 642.7369772879.

The spelling of 265521601 in words is "two hundred sixty-five million, five hundred twenty-one thousand, six hundred one".