163131120503 has 4 divisors (see below), whose sum is σ = 175679668248. Its totient is φ = 150582572760.

The previous prime is 163131120461. The next prime is 163131120553. The reversal of 163131120503 is 305021131361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305021131361 = 1217 ⋅250633633.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163131120503 is a prime.

It is a super-2 number, since 2×163131120503² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163131120553) 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, 6274273853 + ... + 6274273878.

It is an arithmetic number, because the mean of its divisors is an integer number (43919917062).

Almost surely, 2^163131120503 is an apocalyptic number.

163131120503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

163131120503 is a deficient number, since it is larger than the sum of its proper divisors (12548547745).

163131120503 is a wasteful number, since it uses less digits than its factorization.

163131120503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12548547744.

The product of its (nonzero) digits is 1620, while the sum is 26.

Adding to 163131120503 its reverse (305021131361), we get a palindrome (468152251864).

The spelling of 163131120503 in words is "one hundred sixty-three billion, one hundred thirty-one million, one hundred twenty thousand, five hundred three".