15116321 has 4 divisors (see below), whose sum is σ = 16490544. Its totient is φ = 13742100.

The previous prime is 15116317. The next prime is 15116333. The reversal of 15116321 is 12361151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12361151 = 11 ⋅1123741.

It is a cyclic number.

It is not a de Polignac number, because 15116321 - 2² = 15116317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15116293 and 15116302.

It is not an unprimeable number, because it can be changed into a prime (15116351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687095 + ... + 687116.

It is an arithmetic number, because the mean of its divisors is an integer number (4122636).

Almost surely, 2^15116321 is an apocalyptic number.

15116321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15116321 is a deficient number, since it is larger than the sum of its proper divisors (1374223).

15116321 is a wasteful number, since it uses less digits than its factorization.

15116321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374222.

The product of its digits is 180, while the sum is 20.

The square root of 15116321 is about 3887.9713219107. The cubic root of 15116321 is about 247.2570605301.

Adding to 15116321 its reverse (12361151), we get a palindrome (27477472).

The spelling of 15116321 in words is "fifteen million, one hundred sixteen thousand, three hundred twenty-one".