15225561 has 24 divisors (see below), whose sum is σ = 23849280. Its totient is φ = 9304416.

The previous prime is 15225559. The next prime is 15225583. The reversal of 15225561 is 16552251.

15225561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15225561 - 2¹ = 15225559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15225521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20580 + ... + 21306.

It is an arithmetic number, because the mean of its divisors is an integer number (993720).

Almost surely, 2^15225561 is an apocalyptic number.

It is an amenable number.

15225561 is a deficient number, since it is larger than the sum of its proper divisors (8623719).

15225561 is a wasteful number, since it uses less digits than its factorization.

15225561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925 (or 922 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 15225561 is about 3901.9944900012. The cubic root of 15225561 is about 247.8512429521.

The spelling of 15225561 in words is "fifteen million, two hundred twenty-five thousand, five hundred sixty-one".