161230503 has 16 divisors (see below), whose sum is σ = 249714176. Its totient is φ = 90620640.

The previous prime is 161230493. The next prime is 161230507. The reversal of 161230503 is 305032161.

It is not a de Polignac number, because 161230503 - 2⁶ = 161230439 is a prime.

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

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161230503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161230507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61651 + ... + 64212.

It is an arithmetic number, because the mean of its divisors is an integer number (15607136).

Almost surely, 2^161230503 is an apocalyptic number.

161230503 is a deficient number, since it is larger than the sum of its proper divisors (88483673).

161230503 is a wasteful number, since it uses less digits than its factorization.

161230503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125934.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 161230503 is about 12697.6573823678. The cubic root of 161230503 is about 544.2716786998.

Adding to 161230503 its reverse (305032161), we get a palindrome (466262664).

The spelling of 161230503 in words is "one hundred sixty-one million, two hundred thirty thousand, five hundred three".