15113993 has 4 divisors (see below), whose sum is σ = 15321108. Its totient is φ = 14906880.

The previous prime is 15113981. The next prime is 15113999. The reversal of 15113993 is 39931151.

It is a happy number.

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 13162384 + 1951609 = 3628^2 + 1397^2 .

It is a cyclic number.

It is not a de Polignac number, because 15113993 - 2⁶ = 15113929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15113999) 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, 103448 + ... + 103593.

It is an arithmetic number, because the mean of its divisors is an integer number (3830277).

Almost surely, 2^15113993 is an apocalyptic number.

It is an amenable number.

15113993 is a deficient number, since it is larger than the sum of its proper divisors (207115).

15113993 is an equidigital number, since it uses as much as digits as its factorization.

15113993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207114.

The product of its digits is 3645, while the sum is 32.

The square root of 15113993 is about 3887.6719254587. The cubic root of 15113993 is about 247.2443668774.

The spelling of 15113993 in words is "fifteen million, one hundred thirteen thousand, nine hundred ninety-three".