181920103 has 8 divisors (see below), whose sum is σ = 188344080. Its totient is φ = 175506240.

The previous prime is 181920091. The next prime is 181920107. The reversal of 181920103 is 301029181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181920103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181920107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65248 + ... + 67978.

It is an arithmetic number, because the mean of its divisors is an integer number (23543010).

Almost surely, 2^181920103 is an apocalyptic number.

181920103 is a deficient number, since it is larger than the sum of its proper divisors (6423977).

181920103 is a wasteful number, since it uses less digits than its factorization.

181920103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5057.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 181920103 is about 13487.7760583426. The cubic root of 181920103 is about 566.6221718620.

Adding to 181920103 its reverse (301029181), we get a palindrome (482949284).

The spelling of 181920103 in words is "one hundred eighty-one million, nine hundred twenty thousand, one hundred three".