13161603 has 32 divisors (see below), whose sum is σ = 22199296. Its totient is φ = 6749568.

The previous prime is 13161601. The next prime is 13161703. The reversal of 13161603 is 30616131.

It is not a de Polignac number, because 13161603 - 2¹ = 13161601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 13161603.

It is not an unprimeable number, because it can be changed into a prime (13161601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9450 + ... + 10752.

It is an arithmetic number, because the mean of its divisors is an integer number (693728).

Almost surely, 2^13161603 is an apocalyptic number.

13161603 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13161603 is a deficient number, since it is larger than the sum of its proper divisors (9037693).

13161603 is a wasteful number, since it uses less digits than its factorization.

13161603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 13161603 is about 3627.8923633427. The cubic root of 13161603 is about 236.1037739060.

Adding to 13161603 its reverse (30616131), we get a palindrome (43777734).

The spelling of 13161603 in words is "thirteen million, one hundred sixty-one thousand, six hundred three".