15225545 has 4 divisors (see below), whose sum is σ = 18270660. Its totient is φ = 12180432.

The previous prime is 15225533. The next prime is 15225547. The reversal of 15225545 is 54552251.

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 5812921 + 9412624 = 2411^2 + 3068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15225545 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15225547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522550 + ... + 1522559.

It is an arithmetic number, because the mean of its divisors is an integer number (4567665).

Almost surely, 2^15225545 is an apocalyptic number.

It is an amenable number.

15225545 is a deficient number, since it is larger than the sum of its proper divisors (3045115).

15225545 is an equidigital number, since it uses as much as digits as its factorization.

15225545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045114.

The product of its digits is 10000, while the sum is 29.

The square root of 15225545 is about 3901.9924397672. The cubic root of 15225545 is about 247.8511561327.

Adding to 15225545 its reverse (54552251), we get a palindrome (69777796).

The spelling of 15225545 in words is "fifteen million, two hundred twenty-five thousand, five hundred forty-five".