15798121 has 4 divisors (see below), whose sum is σ = 15808912. Its totient is φ = 15787332.

The previous prime is 15798119. The next prime is 15798163. The reversal of 15798121 is 12189751.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 15798121 - 2¹ = 15798119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15798221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2775 + ... + 6268.

It is an arithmetic number, because the mean of its divisors is an integer number (3952228).

Almost surely, 2^15798121 is an apocalyptic number.

It is an amenable number.

15798121 is a deficient number, since it is larger than the sum of its proper divisors (10791).

15798121 is an equidigital number, since it uses as much as digits as its factorization.

15798121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10790.

The product of its digits is 5040, while the sum is 34.

The square root of 15798121 is about 3974.6850189669. The cubic root of 15798121 is about 250.9199228161.

The spelling of 15798121 in words is "fifteen million, seven hundred ninety-eight thousand, one hundred twenty-one".