161430503 has 4 divisors (see below), whose sum is σ = 173848248. Its totient is φ = 149012760.

The previous prime is 161430497. The next prime is 161430509. The reversal of 161430503 is 305034161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305034161 = 599 ⋅509239.

It is an interprime number because it is at equal distance from previous prime (161430497) and next prime (161430509).

It is not a de Polignac number, because 161430503 - 2⁶ = 161430439 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161430509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6208853 + ... + 6208878.

It is an arithmetic number, because the mean of its divisors is an integer number (43462062).

Almost surely, 2^161430503 is an apocalyptic number.

161430503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161430503 is a deficient number, since it is larger than the sum of its proper divisors (12417745).

161430503 is a wasteful number, since it uses less digits than its factorization.

161430503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12417744.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 161430503 is about 12705.5304100222. The cubic root of 161430503 is about 544.4966348028.

Adding to 161430503 its reverse (305034161), we get a palindrome (466464664).

The spelling of 161430503 in words is "one hundred sixty-one million, four hundred thirty thousand, five hundred three".