15131223 has 6 divisors (see below), whose sum is σ = 21856224. Its totient is φ = 10087476.

The previous prime is 15131209. The next prime is 15131231. The reversal of 15131223 is 32213151.

It is not a de Polignac number, because 15131223 - 2⁶ = 15131159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15131196 and 15131205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15131203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 840615 + ... + 840632.

It is an arithmetic number, because the mean of its divisors is an integer number (3642704).

Almost surely, 2^15131223 is an apocalyptic number.

15131223 is a deficient number, since it is larger than the sum of its proper divisors (6725001).

15131223 is a wasteful number, since it uses less digits than its factorization.

15131223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681253 (or 1681250 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 15131223 is about 3889.8872734309. The cubic root of 15131223 is about 247.3382843187.

Adding to 15131223 its reverse (32213151), we get a palindrome (47344374).

The spelling of 15131223 in words is "fifteen million, one hundred thirty-one thousand, two hundred twenty-three".