15013121 has 4 divisors (see below), whose sum is σ = 15031044. Its totient is φ = 14995200.

The previous prime is 15013111. The next prime is 15013127. The reversal of 15013121 is 12131051.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8439025 + 6574096 = 2905^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 15013121 - 2¹⁰ = 15012097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15013096 and 15013105.

It is not an unprimeable number, because it can be changed into a prime (15013127) 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, 7640 + ... + 9401.

It is an arithmetic number, because the mean of its divisors is an integer number (3757761).

Almost surely, 2^15013121 is an apocalyptic number.

It is an amenable number.

15013121 is a deficient number, since it is larger than the sum of its proper divisors (17923).

15013121 is an equidigital number, since it uses as much as digits as its factorization.

15013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17922.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 15013121 is about 3874.6768897548. The cubic root of 15013121 is about 246.6930957397.

Adding to 15013121 its reverse (12131051), we get a palindrome (27144172).

The spelling of 15013121 in words is "fifteen million, thirteen thousand, one hundred twenty-one".