15226561 has 4 divisors (see below), whose sum is σ = 17401792. Its totient is φ = 13051332.

The previous prime is 15226553. The next prime is 15226567. The reversal of 15226561 is 16562251.

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 an emirpimes, since its reverse is a distinct semiprime: 16562251 = 1979 ⋅8369.

It is not a de Polignac number, because 15226561 - 2³ = 15226553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15226567) 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, 1087605 + ... + 1087618.

It is an arithmetic number, because the mean of its divisors is an integer number (4350448).

Almost surely, 2^15226561 is an apocalyptic number.

It is an amenable number.

15226561 is a deficient number, since it is larger than the sum of its proper divisors (2175231).

15226561 is an equidigital number, since it uses as much as digits as its factorization.

15226561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175230.

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

The square root of 15226561 is about 3902.1226274939. The cubic root of 15226561 is about 247.8566690426.

It can be divided in two parts, 15 and 226561, that added together give a square (226576 = 476²).

The spelling of 15226561 in words is "fifteen million, two hundred twenty-six thousand, five hundred sixty-one".