15231216 has 160 divisors (see below), whose sum is σ = 52996608. Its totient is φ = 3640320.

The previous prime is 15231173. The next prime is 15231241. The reversal of 15231216 is 61213251.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 15231192 and 15231201.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 47890 + ... + 48206.

Almost surely, 2^15231216 is an apocalyptic number.

15231216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15231216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26498304).

15231216 is an abundant number, since it is smaller than the sum of its proper divisors (37765392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15231216 is a wasteful number, since it uses less digits than its factorization.

15231216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359 (or 353 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 15231216 is about 3902.7190521481. The cubic root of 15231216 is about 247.8819243676.

Adding to 15231216 its reverse (61213251), we get a palindrome (76444467).

The spelling of 15231216 in words is "fifteen million, two hundred thirty-one thousand, two hundred sixteen".