15641225 has 12 divisors (see below), whose sum is σ = 19445184. Its totient is φ = 12480720.

The previous prime is 15641221. The next prime is 15641233. The reversal of 15641225 is 52214651.

It is not a de Polignac number, because 15641225 - 2² = 15641221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15641194 and 15641203.

It is not an unprimeable number, because it can be changed into a prime (15641221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15692 + ... + 16658.

It is an arithmetic number, because the mean of its divisors is an integer number (1620432).

Almost surely, 2^15641225 is an apocalyptic number.

It is an amenable number.

15641225 is a deficient number, since it is larger than the sum of its proper divisors (3803959).

15641225 is an equidigital number, since it uses as much as digits as its factorization.

15641225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624 (or 1619 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 15641225 is about 3954.8988609066. The cubic root of 15641225 is about 250.0865033985.

Adding to 15641225 its reverse (52214651), we get a palindrome (67855876).

The spelling of 15641225 in words is "fifteen million, six hundred forty-one thousand, two hundred twenty-five".