13220625 has 40 divisors (see below), whose sum is σ = 24067296. Its totient is φ = 6400000.

The previous prime is 13220609. The next prime is 13220629. The reversal of 13220625 is 52602231.

13220625 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13220625 - 2⁴ = 13220609 is a prime.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13220629) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20305 + ... + 20945.

Almost surely, 2^13220625 is an apocalyptic number.

13220625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13220625 is a deficient number, since it is larger than the sum of its proper divisors (10846671).

13220625 is an equidigital number, since it uses as much as digits as its factorization.

13220625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 13220625 is about 3636.0177392307. The cubic root of 13220625 is about 236.4561762220.

Adding to 13220625 its reverse (52602231), we get a palindrome (65822856).

It can be divided in two parts, 132206 and 25, that added together give a palindrome (132231).

The spelling of 13220625 in words is "thirteen million, two hundred twenty thousand, six hundred twenty-five".