2605621201 has 4 divisors (see below), whose sum is σ = 2605736304. Its totient is φ = 2605506100.

The previous prime is 2605621199. The next prime is 2605621231. The reversal of 2605621201 is 1021265062.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1021265062 = 2 ⋅510632531.

It is a cyclic number.

It is not a de Polignac number, because 2605621201 - 2¹ = 2605621199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2605621231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11095 + ... + 73036.

It is an arithmetic number, because the mean of its divisors is an integer number (651434076).

Almost surely, 2^2605621201 is an apocalyptic number.

It is an amenable number.

2605621201 is a deficient number, since it is larger than the sum of its proper divisors (115103).

2605621201 is an equidigital number, since it uses as much as digits as its factorization.

2605621201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115102.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2605621201 is about 51045.2857862506. The cubic root of 2605621201 is about 1376.0591202472.

Adding to 2605621201 its reverse (1021265062), we get a palindrome (3626886263).

The spelling of 2605621201 in words is "two billion, six hundred five million, six hundred twenty-one thousand, two hundred one".