15216641 has 4 divisors (see below), whose sum is σ = 16599984. Its totient is φ = 13833300.

The previous prime is 15216623. The next prime is 15216647. The reversal of 15216641 is 14661251.

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: 14661251 = 11 ⋅1332841.

It is a cyclic number.

It is not a de Polignac number, because 15216641 - 2¹⁰ = 15215617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15216641.

It is not an unprimeable number, because it can be changed into a prime (15216647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691655 + ... + 691676.

It is an arithmetic number, because the mean of its divisors is an integer number (4149996).

It is a Proth number, since it is equal to 3715 ⋅ 2¹² + 1 and 3715 < 2¹².

Almost surely, 2^15216641 is an apocalyptic number.

15216641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15216641 is a deficient number, since it is larger than the sum of its proper divisors (1383343).

15216641 is a wasteful number, since it uses less digits than its factorization.

15216641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383342.

The product of its digits is 1440, while the sum is 26.

The square root of 15216641 is about 3900.8513173409. The cubic root of 15216641 is about 247.8028317097.

Adding to 15216641 its reverse (14661251), we get a palindrome (29877892).

The spelling of 15216641 in words is "fifteen million, two hundred sixteen thousand, six hundred forty-one".