15551223 has 8 divisors (see below), whose sum is σ = 20756736. Its totient is φ = 10356600.

The previous prime is 15551213. The next prime is 15551231. The reversal of 15551223 is 32215551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 15551223 - 2⁵ = 15551191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15551193 and 15551202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15551203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1588 + ... + 5798.

It is an arithmetic number, because the mean of its divisors is an integer number (2594592).

Almost surely, 2^15551223 is an apocalyptic number.

15551223 is a deficient number, since it is larger than the sum of its proper divisors (5205513).

15551223 is a wasteful number, since it uses less digits than its factorization.

15551223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5445.

The product of its digits is 1500, while the sum is 24.

The square root of 15551223 is about 3943.5038988189. The cubic root of 15551223 is about 249.6059017394.

Adding to 15551223 its reverse (32215551), we get a palindrome (47766774).

The spelling of 15551223 in words is "fifteen million, five hundred fifty-one thousand, two hundred twenty-three".