16503113 has 4 divisors (see below), whose sum is σ = 18003408. Its totient is φ = 15002820.

The previous prime is 16503089. The next prime is 16503119. The reversal of 16503113 is 31130561.

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.

It is a cyclic number.

It is not a de Polignac number, because 16503113 - 2¹⁸ = 16240969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16503119) 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, 750131 + ... + 750152.

It is an arithmetic number, because the mean of its divisors is an integer number (4500852).

Almost surely, 2^16503113 is an apocalyptic number.

It is an amenable number.

16503113 is a deficient number, since it is larger than the sum of its proper divisors (1500295).

16503113 is a wasteful number, since it uses less digits than its factorization.

16503113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500294.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 16503113 is about 4062.4023680576. The cubic root of 16503113 is about 254.5981778659.

Adding to 16503113 its reverse (31130561), we get a palindrome (47633674).

The spelling of 16503113 in words is "sixteen million, five hundred three thousand, one hundred thirteen".