15216481 has 8 divisors (see below), whose sum is σ = 17418240. Its totient is φ = 13021728.

The previous prime is 15216463. The next prime is 15216493. The reversal of 15216481 is 18461251.

15216481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 15216481 - 2⁵ = 15216449 is a prime.

It is a super-2 number, since 2×15216481² = 463082588046722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (15216181) 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, 4320 + ... + 7006.

It is an arithmetic number, because the mean of its divisors is an integer number (2177280).

Almost surely, 2^15216481 is an apocalyptic number.

It is an amenable number.

15216481 is a deficient number, since it is larger than the sum of its proper divisors (2201759).

15216481 is an equidigital number, since it uses as much as digits as its factorization.

15216481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503.

The product of its digits is 1920, while the sum is 28.

The square root of 15216481 is about 3900.8308089431. The cubic root of 15216481 is about 247.8019631739.

The spelling of 15216481 in words is "fifteen million, two hundred sixteen thousand, four hundred eighty-one".