15123013 has 4 divisors (see below), whose sum is σ = 16012620. Its totient is φ = 14233408.

The previous prime is 15123011. The next prime is 15123023. The reversal of 15123013 is 31032151.

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 8661249 + 6461764 = 2943^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 15123013 - 2¹ = 15123011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15123011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444778 + ... + 444811.

It is an arithmetic number, because the mean of its divisors is an integer number (4003155).

Almost surely, 2^15123013 is an apocalyptic number.

It is an amenable number.

15123013 is a deficient number, since it is larger than the sum of its proper divisors (889607).

15123013 is an equidigital number, since it uses as much as digits as its factorization.

15123013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889606.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 15123013 is about 3888.8318297401. The cubic root of 15123013 is about 247.2935420730.

Adding to 15123013 its reverse (31032151), we get a palindrome (46155164).

The spelling of 15123013 in words is "fifteen million, one hundred twenty-three thousand, thirteen".